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Summary :

Does your disk appear as unknown or not initialized in Disk Management? This post talks about the two causes of this issue: unallocated space or no size. Keep reading to learn how to fix and recover data from a not initialized or unallocated disk.
Quick Navigation :
Hard Disk Shows 'Unknown Not Initialized' in Windows'When I plug in the drive, it says that it's successfully installed however it does not appear in 'my computer'. Also when I go into system tools it says that disk 1 is unknown, not initialized, unallocated. Can you please help me, I don't want to lose my data, it contains all my pictures.'sevenforumLike the case above, the issue 'disk unknown not initialized' happens not only on removable hard drives but also on internal or external hard drives from major manufacturers like Western Digital, Samsung, etc in Windows 10/8/7.
When it occurs, your hard drive may show unallocated space in Disk Management, and the data on which will be inaccessible.
In addition, there is another situation: there is no disk space shown in Disk Management.
Tip: Sometimes you may find your external hard drive not showing up. What should you do? This post - 10 Situations Where External Hard Drive Not Showing up & Solutions shows you the fixes.
In general, a disk being unknown or uninitialized can be caused by various events including a virus attack, corrupted Master Boot Record, partition loss, bad sectors, and some computer file system corruption. If you are having trouble fixing your hard disk, please try the following solutions.
How to Solve Disk Unknown Not Initialized Windows 10/8/7Case 1: Disk Unknown, Not initialized, Unallocated
First of all, open Disk Management and find the uninitialized disk. If its disk capacity is shown, that means your Windows operating system has recognized this disk, but its partition is lost or MBR is corrupted due to some reasons. In this case, you can use a professional software to fix the MBR and recover the partition.
Solution 1: Initialize Your Hard DriveWhen it comes to hard disk not initialized, the first thing that you may do is to initialize this hard drive. https://downtfile393.weebly.com/vector-magic-desktop-edition-1-20.html. Run Disk Management by right-clicking 'My computer' and then selecting 'Manage'. You can also press the keys 'Win + R' and input 'compmgmt.msc' to run the partition management tool.
Next, find the external hard drive connected to THIS computer. You will see this unknown disk appearing as 'unallocated'. If this external hard drive does not contain any important files, you can go ahead and initialize the disk without losing data. In Windows 10, initializing the disk to MBR or GPT should directly solve this problem.
Tip: What happens if I initialize my disk? Disk initialization can wipe out all the data and cause data loss. As a result, if you have stored a large amount of data on the external hard drive, an initialization operation like this is not recommended.
Therefore, due to the effects of data loss, this solution is not always the best.
Solution 2: Rebuild MBRMBR, short for Master Boot Record, is a special type of boot sector at the beginning of the hard drive. It could possibly be corrupted due to many reasons, such as malware infection, accidental power failure, and mistaken operation.
If the MBR gets corrupted, the operating system will no longer know where to access its data. This is when the issue 'disk 1 unknown not initialized external hard drive' could occur. Therefore, you need to rebuild MBR for your hard disk to solve this issue.
Disk Doctor 3 8 – Free Up Disk Spaces DownloadHow to fix MBR in Windows 10?
You might have heard about a highly popular tool for partition and disk management - MiniTool Partition Wizard.
This partition and disk manager is designed to do partition and disk management in different operating systems, including Windows Vista/XP/7/8/8.1/10, Windows Server 2003/2008/2012/2016.
It has multiple different editions - Free, Pro, Pro Deluxe, Pro Ultimate, Server, Enterprise, and Technician Edition - each having different functions. Click here to learn about their differences.
To fix a corrupted Master Boot Record, using the Free Edition would suffice. First, download this free tool and install it on your computer.
Step 1: Run MiniTool Partition Wizard Free Edition.
Step 2: In the left pane of the main interface, select the unknown external hard drive and click 'Rebuild MBR' from 'Check Disk' menu. You can also right-click the target disk and select this function.
Step 3: You will be prompted back to the main interface. Here, click 'Apply' to execute the change.
If this method also cannot fix the issue - disk 1 unknown not initialized Western Digital, try another solution as follows.
Solution 3: Partition RecoveryRebuilding MBR cannot always fully work on the 'disk unknown not initialized' issue. In Disk Management, if you find disk shows unallocated space, just try to do partition recovery.
Note: Don't create a new partition on the unallocated disk, or it will be really difficult for partition recovery.
MiniTool Partition Wizard also provides a feature called 'Partition Recovery'. It helps you recover the lost partition as well as its data. This will be useful as long as the new partition has not been created.
Note that this is a paid feature. To use it, you can purchase its Pro Ultimate Edition.
Tip: Hard drives (both MBR and GPT) that have disk unknown not initialized issue will be shown as MBR disk in Partition Wizard. If it was a GPT disk and now is shown as MBR, please convert it to GPT before you recover partition. Otherwise, there will be a failure.
If you find the message 'hard drive not initialized in Disk Management', please try this solution in sevenforums using partition recovery to solve this issue. Here is a step-by-step guide below in Windows 10.
Step 1: Run MiniTool Partition Wizard. Then right-click on the target disk that has 'unallocated space', and select 'Partition Recovery'. Alternatively, click this function from the 'Check Disk' drop-down menu.
Note: It is likely that your external hard drive could appear as 'bad disk' in MiniTool Partition Wizard. In this case, you can also right-click on this disk to make a partition recovery.
Step 2: Select the scanning range for the specified disk. https://truedfil420.weebly.com/adobe-indesign-cs5-me-portable-free-download.html. There are three scanning range as follows:
Full Disk scans the entire disk, which is very useful for finding the lost partition.
Unallocated Space helps to only scan free space.
Specified Range scans specified sectors. When clicking this option, you can change 'Starting LBA' and 'Ending LBA' according to your needs.
Choose one of the scanning range as you like, then click 'Next' to continue.
Step 3: Select a scanning method.
Quick Scanrestores your partition if your lost/deleted partitions are continuous. When the program finds a lost/deleted partition, it will jump to the end of the partition to continue scanning other lost/deleted partitions.
Full Scanwill scan each sector of the specified scanning range. If quick scan cannot find the lost partitions, try full scan.
Click 'Next' to continue doing partition recovery.
Step 4: Wait for this scan to complete finding the lost or deleted partitions. After finishing a scan, all lost partitions will be displayed in the following list. Please select the partitions you need.
Here you can double-click the searched partition to explore its content. After selecting your desired partitions, click 'Finish' to go back to the main interface.
Step 5: In the main interface, you can preview all lost partitions. Click 'Apply' to execute all changes.
Tip: This screenshot shows you the partitions you will recover, which have not been assigned drive letters. You need to use MiniTool Partition Wizard to change drive letter.
Get MiniTool Partition Wizard now to try fixing the hard drive not initialized in Disk Management issue. If you find it useful, share it with other people to help them too.
After performing partition recovery, the issue of disk 1 unknown not initialized external hard drive should be fixed, and all data on this disk should be able to be accessed. New version pubg mobile ios.
Solution 4: Recover Data from Unknown DiskWhat should do if you have a large amount of important data saved on a hard drive with lost or deleted partitions, and 'Partition Recovery' can't help you?
Don't panic! The data on your external hard drive can be recovered by MiniTool. It offers a 'Data Recovery' feature that quickly recovers data when a hard drive is not initialized with simple clicks. Try it with MiniTool Partition Wizard Pro Ultimate.
Step 1: Choose the unknown not initialized disk and click the 'Data Recovery' feature from 'Check Disk'.
Step 2: This software will start scanning the selected disk; wait patiently until the scan completes.
Step 3: After the scan is complete, you can check the files that you need from the list it shows you. Then choose these items and click 'Save' to recover them to a safe location.
Related article:Recover Data from Disk Shows as Unknown without Damaging It
For more information about case 1, you can watch the following video.
Case 2: Disk Unknown Not Initialized No size in Disk Management
If Disk Management is unable to show any information on neither this hard drive nor its disk capacity, the hard drive might have some disk problem or cartridge problem. Performing operations might be blocked by the 'external hard disk not initialized I/O' error.
Solution 1: Turn off PC and Remove BatteryPerhaps disk unknown not initialized no size issue is caused by the PC motherboard issue. Just try to remove the battery to fix the issue:
Turn off the computer.
Disconnect the data and power cables from the problematic drive.
Remove the CMOS battery for ten more seconds.
Insert the CMOS battery.
Turn on the computer.
Shut down your computer.
Connect data and power cable of the problematic drive.
Start the computer. 
If this method doesn't work, please continue reading.
Solution 2: Replace the Bad External Hard DriveUsually, Disk Management is unable to grab the disk information or the capacity of a disk that is unknown or not initialized. This issue could still exist even when you connect the disk to another computer.
In this case, you should take this disk out and send it to professionals for an inspection. If there is a physical error, the only solution to the unknown not initialized no size issue is to throw it away and replace this bad external hard drive.
In addition, there are still some disk problems in Disk Management, such as hard disk is not detected and hard drive space is missing, the following two articles could be useful.
ConclusionIn summary, this issue 'disk unknown not initialized' can be solved quickly and easily with the assistance of MiniTool Partition Wizard. When addressing this problem, please try MiniTool products to rebuild MBR, recover partition and retrieve data. Hope you find this post useful.
Please leave a comment below or contact [email protected] if you have any suggestion or question. Thanks in advance! 
Disk Unknown Not Initialized FAQ???? How do I fix disk 1 unknown is not initialized? 
When you encounter the issue of disk unknown not initialized in Windows 10/8/7, you can try multiple solutions to fix it, for example, initialize your hard drive, rebuild MBR, perform partition recovery or recover data from unknown disk, turn off your PC and remove the battery and replace the bad hard drive.
Of course, initializing a disk will erase it. That is, when you initialize a hard drive, you make it usable by Windows operating system but all the contents are removed.
Disk initialization can wipe out all the disk data and cause data loss. If there is a large amount of data on your hard drive, it is not recommended to initialize a disk.
In Windows 10/8/7, press Win +R to open the Run dialog, input diskmgmt.msc and click OK to open Disk Management. Right-click your target hard drive that you need to initialize, choose Initialize Disk and choose a partition style.
Summary :3TB hard drive only uses 2TB? If this is the trouble you encounter, you can never miss out the best solutions in this post. Now get MiniTool Partition Wizard to convert MBR disk to GPT disk without losing data.
Quick Navigation :
Only 2TB Disk Space Shows in Disk ManagementWhile browsing the Windows forums, I find many people are asking about why their 3TB hard drive only uses 2TB and how to address this issue. See a true example below from discussions.virtualdr.com:
I successfully installed my new Western Digital 3TB SATA drive, and since I have a HP p6654y computer with an AMD Athlon II X4630 and a 64-bit operating system, Windows 7 Home Premium, my computer should be able to handle the full size of the disk. 
However, in Disk Management the new drive appears as a 2Tb drive with a 748 GB 'unallocated' segment which cannot be accessed. I have found many articles online which describe why this happens, but nothing that suggests how it can be corrected or if it can. Any guidance greatly appreciated.

Does your disk appear as unknown or not initialized in Disk Management? This post talks about the two causes of this issue: unallocated space or no size. Keep reading to learn how to fix and recover data from a not initialized or unallocated disk.
Quick Navigation :
Hard Disk Shows 'Unknown Not Initialized' in Windows'When I plug in the drive, it says that it's successfully installed however it does not appear in 'my computer'. Also when I go into system tools it says that disk 1 is unknown, not initialized, unallocated. Can you please help me, I don't want to lose my data, it contains all my pictures.'sevenforumLike the case above, the issue 'disk unknown not initialized' happens not only on removable hard drives but also on internal or external hard drives from major manufacturers like Western Digital, Samsung, etc in Windows 10/8/7.
When it occurs, your hard drive may show unallocated space in Disk Management, and the data on which will be inaccessible.
In addition, there is another situation: there is no disk space shown in Disk Management.
Tip: Sometimes you may find your external hard drive not showing up. What should you do? This post - 10 Situations Where External Hard Drive Not Showing up & Solutions shows you the fixes.
In general, a disk being unknown or uninitialized can be caused by various events including a virus attack, corrupted Master Boot Record, partition loss, bad sectors, and some computer file system corruption. If you are having trouble fixing your hard disk, please try the following solutions.
How to Solve Disk Unknown Not Initialized Windows 10/8/7Case 1: Disk Unknown, Not initialized, Unallocated
First of all, open Disk Management and find the uninitialized disk. If its disk capacity is shown, that means your Windows operating system has recognized this disk, but its partition is lost or MBR is corrupted due to some reasons. In this case, you can use a professional software to fix the MBR and recover the partition.
Solution 1: Initialize Your Hard DriveWhen it comes to hard disk not initialized, the first thing that you may do is to initialize this hard drive. https://downtfile393.weebly.com/vector-magic-desktop-edition-1-20.html. Run Disk Management by right-clicking 'My computer' and then selecting 'Manage'. You can also press the keys 'Win + R' and input 'compmgmt.msc' to run the partition management tool.
Next, find the external hard drive connected to THIS computer. You will see this unknown disk appearing as 'unallocated'. If this external hard drive does not contain any important files, you can go ahead and initialize the disk without losing data. In Windows 10, initializing the disk to MBR or GPT should directly solve this problem.
Tip: What happens if I initialize my disk? Disk initialization can wipe out all the data and cause data loss. As a result, if you have stored a large amount of data on the external hard drive, an initialization operation like this is not recommended.
Therefore, due to the effects of data loss, this solution is not always the best.
Solution 2: Rebuild MBRMBR, short for Master Boot Record, is a special type of boot sector at the beginning of the hard drive. It could possibly be corrupted due to many reasons, such as malware infection, accidental power failure, and mistaken operation.
If the MBR gets corrupted, the operating system will no longer know where to access its data. This is when the issue 'disk 1 unknown not initialized external hard drive' could occur. Therefore, you need to rebuild MBR for your hard disk to solve this issue.
Disk Doctor 3 8 – Free Up Disk Spaces DownloadHow to fix MBR in Windows 10?
You might have heard about a highly popular tool for partition and disk management - MiniTool Partition Wizard.
This partition and disk manager is designed to do partition and disk management in different operating systems, including Windows Vista/XP/7/8/8.1/10, Windows Server 2003/2008/2012/2016.
It has multiple different editions - Free, Pro, Pro Deluxe, Pro Ultimate, Server, Enterprise, and Technician Edition - each having different functions. Click here to learn about their differences.
To fix a corrupted Master Boot Record, using the Free Edition would suffice. First, download this free tool and install it on your computer.
Step 1: Run MiniTool Partition Wizard Free Edition.
Step 2: In the left pane of the main interface, select the unknown external hard drive and click 'Rebuild MBR' from 'Check Disk' menu. You can also right-click the target disk and select this function.
Step 3: You will be prompted back to the main interface. Here, click 'Apply' to execute the change.
If this method also cannot fix the issue - disk 1 unknown not initialized Western Digital, try another solution as follows.
Solution 3: Partition RecoveryRebuilding MBR cannot always fully work on the 'disk unknown not initialized' issue. In Disk Management, if you find disk shows unallocated space, just try to do partition recovery.
Note: Don't create a new partition on the unallocated disk, or it will be really difficult for partition recovery.
MiniTool Partition Wizard also provides a feature called 'Partition Recovery'. It helps you recover the lost partition as well as its data. This will be useful as long as the new partition has not been created.
Note that this is a paid feature. To use it, you can purchase its Pro Ultimate Edition.
Tip: Hard drives (both MBR and GPT) that have disk unknown not initialized issue will be shown as MBR disk in Partition Wizard. If it was a GPT disk and now is shown as MBR, please convert it to GPT before you recover partition. Otherwise, there will be a failure.
If you find the message 'hard drive not initialized in Disk Management', please try this solution in sevenforums using partition recovery to solve this issue. Here is a step-by-step guide below in Windows 10.
Step 1: Run MiniTool Partition Wizard. Then right-click on the target disk that has 'unallocated space', and select 'Partition Recovery'. Alternatively, click this function from the 'Check Disk' drop-down menu.
Note: It is likely that your external hard drive could appear as 'bad disk' in MiniTool Partition Wizard. In this case, you can also right-click on this disk to make a partition recovery.
Step 2: Select the scanning range for the specified disk. https://truedfil420.weebly.com/adobe-indesign-cs5-me-portable-free-download.html. There are three scanning range as follows:
Full Disk scans the entire disk, which is very useful for finding the lost partition.
Unallocated Space helps to only scan free space.
Specified Range scans specified sectors. When clicking this option, you can change 'Starting LBA' and 'Ending LBA' according to your needs.
Choose one of the scanning range as you like, then click 'Next' to continue.
Step 3: Select a scanning method.
Quick Scanrestores your partition if your lost/deleted partitions are continuous. When the program finds a lost/deleted partition, it will jump to the end of the partition to continue scanning other lost/deleted partitions.
Full Scanwill scan each sector of the specified scanning range. If quick scan cannot find the lost partitions, try full scan.
Click 'Next' to continue doing partition recovery.
Step 4: Wait for this scan to complete finding the lost or deleted partitions. After finishing a scan, all lost partitions will be displayed in the following list. Please select the partitions you need.
Here you can double-click the searched partition to explore its content. After selecting your desired partitions, click 'Finish' to go back to the main interface.
Step 5: In the main interface, you can preview all lost partitions. Click 'Apply' to execute all changes.
Tip: This screenshot shows you the partitions you will recover, which have not been assigned drive letters. You need to use MiniTool Partition Wizard to change drive letter.
Get MiniTool Partition Wizard now to try fixing the hard drive not initialized in Disk Management issue. If you find it useful, share it with other people to help them too.
After performing partition recovery, the issue of disk 1 unknown not initialized external hard drive should be fixed, and all data on this disk should be able to be accessed. New version pubg mobile ios.
Solution 4: Recover Data from Unknown DiskWhat should do if you have a large amount of important data saved on a hard drive with lost or deleted partitions, and 'Partition Recovery' can't help you?
Don't panic! The data on your external hard drive can be recovered by MiniTool. It offers a 'Data Recovery' feature that quickly recovers data when a hard drive is not initialized with simple clicks. Try it with MiniTool Partition Wizard Pro Ultimate.
Step 1: Choose the unknown not initialized disk and click the 'Data Recovery' feature from 'Check Disk'.
Step 2: This software will start scanning the selected disk; wait patiently until the scan completes.
Step 3: After the scan is complete, you can check the files that you need from the list it shows you. Then choose these items and click 'Save' to recover them to a safe location.
Related article:Recover Data from Disk Shows as Unknown without Damaging It
For more information about case 1, you can watch the following video.
Case 2: Disk Unknown Not Initialized No size in Disk Management
If Disk Management is unable to show any information on neither this hard drive nor its disk capacity, the hard drive might have some disk problem or cartridge problem. Performing operations might be blocked by the 'external hard disk not initialized I/O' error.
Solution 1: Turn off PC and Remove BatteryPerhaps disk unknown not initialized no size issue is caused by the PC motherboard issue. Just try to remove the battery to fix the issue:
Turn off the computer.
Disconnect the data and power cables from the problematic drive.
Remove the CMOS battery for ten more seconds.
Insert the CMOS battery.
Turn on the computer.
Shut down your computer.
Connect data and power cable of the problematic drive.
Start the computer. 
If this method doesn't work, please continue reading.
Solution 2: Replace the Bad External Hard DriveUsually, Disk Management is unable to grab the disk information or the capacity of a disk that is unknown or not initialized. This issue could still exist even when you connect the disk to another computer.
In this case, you should take this disk out and send it to professionals for an inspection. If there is a physical error, the only solution to the unknown not initialized no size issue is to throw it away and replace this bad external hard drive.
In addition, there are still some disk problems in Disk Management, such as hard disk is not detected and hard drive space is missing, the following two articles could be useful.
ConclusionIn summary, this issue 'disk unknown not initialized' can be solved quickly and easily with the assistance of MiniTool Partition Wizard. When addressing this problem, please try MiniTool products to rebuild MBR, recover partition and retrieve data. Hope you find this post useful.
Please leave a comment below or contact [email protected] if you have any suggestion or question. Thanks in advance! 
Disk Unknown Not Initialized FAQ???? How do I fix disk 1 unknown is not initialized? 
When you encounter the issue of disk unknown not initialized in Windows 10/8/7, you can try multiple solutions to fix it, for example, initialize your hard drive, rebuild MBR, perform partition recovery or recover data from unknown disk, turn off your PC and remove the battery and replace the bad hard drive.
Of course, initializing a disk will erase it. That is, when you initialize a hard drive, you make it usable by Windows operating system but all the contents are removed.
Disk initialization can wipe out all the disk data and cause data loss. If there is a large amount of data on your hard drive, it is not recommended to initialize a disk.
In Windows 10/8/7, press Win +R to open the Run dialog, input diskmgmt.msc and click OK to open Disk Management. Right-click your target hard drive that you need to initialize, choose Initialize Disk and choose a partition style.
Summary :3TB hard drive only uses 2TB? If this is the trouble you encounter, you can never miss out the best solutions in this post. Now get MiniTool Partition Wizard to convert MBR disk to GPT disk without losing data.
Quick Navigation :
Only 2TB Disk Space Shows in Disk ManagementWhile browsing the Windows forums, I find many people are asking about why their 3TB hard drive only uses 2TB and how to address this issue. See a true example below from discussions.virtualdr.com:
I successfully installed my new Western Digital 3TB SATA drive, and since I have a HP p6654y computer with an AMD Athlon II X4630 and a 64-bit operating system, Windows 7 Home Premium, my computer should be able to handle the full size of the disk. 
However, in Disk Management the new drive appears as a 2Tb drive with a 748 GB 'unallocated' segment which cannot be accessed. I have found many articles online which describe why this happens, but nothing that suggests how it can be corrected or if it can. Any guidance greatly appreciated.To give a clearer description of 3TB hard drive only uses 2TB, I have prepared a picture for you to show this issue. See Disk 2 has a 3TB storage space, on which there is a partition F that takes up 2TB disk space and still 746GB disk space is shown as unallocated.
The strange thing is that the unallocated space is neither available to be used for extending partition F, nor to be used for creating a new volume. Both options are grayed out.
Here are the possible reasons for Extend Volume grayed out in Disk Management, and users will be given corresponding solutions at the same time.
Have you ever encountered this kind of hard drive issue? Have you finally worked it out? If you are still confused, you should never miss out this article. Detailed explanations and solutions to 3TB hard drive showing as 2TB are given consecutively.
Why 3TB Hard Drive Showing as 2TBSimply put, this is caused by the MBR (Master Boot Record) partition table. You must use GPT (GUID Partition Table) rather than MBR to format a drive over 2TB.
Take a look in Disk Management utility and see what type of partition your drive has, it's easy:
Right-click the 3TB hard disk drive and go for Properties.
Then navigate to Volumes and see what partition style you get. If it shows Mater Boot Record (MBR), your 3TB hard drive is an MBR disk. And if it is an MBR, repartition using GPT.
About MBR and GPTMBR is short for Master Boot Record. MBR disks use the Legacy BIOS and support up to 4 primary partitions or 3 primary partitions plus 1 extended partition. MBR disks enjoy great compatibility and are supported by all Windows operating systems.
GPT is short for GUID Partition Table. GPT disks use UEFI BIOS and support up to 128 primary partitions in Windows. Compared with MBR, GPT enjoys better reliability and protection:
First of all, there is no actual limit to the size of hard drives with GPT partition structure. For disks with 3TB and larger capacity, GPT is the first choice.
Secondly, boot data and partition data are stored in multiple places in GPT partition structure. Hence, there are methods for recovery if something happens to one.
Thirdly, GPT-based drives will perform Cyclic Redundancy Checks for the booting and partition data stored. If the main data is being corrupted, the drive will try to do the recovery by copying data from other locations. But in MBR, you have to do that manually.
Note: GPT is not without its problems. For instance, GPT disks are only supported by the latest Windows operating systems. Please refer to the table below to learn GPT compatibility. Besides, booting from a GPT disk is not possible unless the system uses the UEFI rather than a legacy BIOS.
OSData DiskSystem Disk
Window XP 32 bitDoesn't support GPT partitionDoesn't support GPT partition
Window XP 64 bitSupport GPT partitionDoesn't support GPT partition
Window Vista 32 bitSupport GPT partitionDoesn't support GPT partition
Window Vista 64 bitSupport GPT partitionSupport GPT partition, requires UEFI
Window 7 32 bitSupport GPT partitionDoesn't support GPT partition
Window 7 64 bitSupport GPT partitionSupport GPT partition, requires UEFI
Window 8 32 bitSupport GPT partitionDoesn't support GPT partition
Window 8 64 bitSupport GPT partitionSupport GPT partition, requires UEFI
Window 10 32 bitSupport GPT partitionDoesn't support GPT partition
Window 10 64 bitSupport GPT partitionSupport GPT partition, requires UEFI
MBR VS GPT, which one is better for your SSD? Focus on the exact difference to get the answer and safely convert your disk to MBR or GPT.
Now you know what exactly causes 3TB hard drive showing as 2TB, and the 3TB hard drive must employ GPT partition style, you may ask how to do that. Next, I will give you detailed instructions on how to convert 3TB MBR disk to GPT.
3 Ways to Resolve 3TB hard drive showing as 2TBIn this part, 3 ways are introduced to convert MBR to GPT. Please read the note carefully before you choose a way to start.
Note:To convert MBR boot drive to GPT disk, make sure your computer motherboard supports UEFI/EFI firmware. And, make sure your operating system accepts GPT partition.
Way 1 is the only choice if you want to convert MBR to GPT without data loss. Way 2 and Way 3 require partition deletion before the conversion.
Way 1: Convert Disk from MBR to GPT without Data LossFirst and foremost, I recommend using MiniTool Partition Wizard to convert MBR to GPT, because it will keep your data safe and intact. This means you can directly convert the hard disk instead of deleting/formatting any partition. Besides, it not only deals with data drive but also is valid for the system disk.
Now get this powerful partition manager which works for Windows 10/8/7 both 32 bit and 64 bit.
Step 1. Install and launch MiniTool Partition Wizard to the main interface.
Step 2. On disk map, select the 3TB hard drive and choose Convert MBR Disk to GPT Disk from the action panel or right-click the 3TB hard drive and choose Convert MBR Disk to GPT Disk from the context menu.
Creative market gold paint photo effect 1256404 download free. Step 3. At the top menu bar, click Apply to start the conversion. If you are converting the system disk, a reboot is required.
When the conversion is completed, you can make full use of 3TB external hard drive by extending the existing partition or creating a new partition.
Way 2. Convert Disk from MBR to GPT Using Command PromptWindows Command Prompt is a common way to convert MBR disk to GPT disk. But you have to delete all partitions on the 3TB hard drive first. Now follow the steps below and you can change the MBR disk to GPT disk.
Step 1. Run Diskpart as administrator.
Step 2. Run the following command one by one:
Type list disk and press Enter. It will list all the disks connected to the computer.
Type select disk n (n is the number of the target disk you want to convert) and press Enter.
Type list partition and press Enter. It will list all the partitions on the selected disk.
Type select partition n (n is the number of the volume you need to delete) and press Enter.
Type delete partition and press Enter.
Repeat the former two to delete all the rest partitions if you have more.
Type convert gpt and press Enter.
Step 3. Now the 3TB hard drive becomes all unallocated. To make use of all the disk space, you can continue creating a primary partition on the 3TB hard drive.
Type create partition primary and press Enter.
Type assign letter=N (N can be replaced by any letter that is not occupied currently) and press Enter.
Type format fs=ntfs quick and press Enter.
Type exit and press Enter.
By doing so, you have finished converting MBR disk to GPT disk. Now since the 3TB hard drive uses a GPT partition table, you shouldn't have any problems formatting the whole 3TB as an NTFS partition.
Way 3. Convert Disk from MBR to GPT Using Disk ManagementI believe most people are more familiar with using Windows Disk Management. With concise interface, this utility is also easy to handle. However, I have to remind you that this way also leads to data loss unless a backup is made in advance.
Step 1. Right-click the volume on the 3TB hard drive and choose Delete Volume.
Step 2. You will see a prompt saying that deleting this volume will erase all data on it. If you have made a backup, you can click Yes to go on.
Step 3. Now you get two unallocated space on the 3TB hard drive. At this time, right-click the disk and choose Convert to GPT Disk from the context menu.
When you get only one unallocated space on the drive, you can right-click the unallocated space and choose New Simple Volume to create a new volume that occupies all 3TB disk space.
Do you know how to solve the '3TB drive shows 746GB' issue? This article shows three reasons as well as corresponding solutions to deal with this problem.
Now you have got the best skills to convert MBR disk to GPT when your 3TB hard drive only uses 2TB. By comparison, you know MiniTool Partition Wizard is the top choice because it is easy to use and can keep all data intact. If you are interested, why not have a try?
Top 10 Features of Partition Wizard for 3TB Hard Drive ManagementMiniTool Partition Wizard not only helps to convert MBR disk to GPT disk, it also enables to do a lot of hard drive management. No matter what features you need to maintain your hard drive partitions, you can always turn to this tool to get help. In my experience, the top 10 important functions we can find in MiniTool Partition Wizard are the followings. Please do not hesitate to use MiniTool Partition Wizard if you have such needs:
Copy Disk: Copy hard drive to another 3TB drive so as to make a disk backup or to upgrade hard drive.
Partition Recovery: Recover partitions lost by various reasons like accidental deletion or diskpart clean.
Convert Dynamic Disk to Basic Disk: Convert dynamic disk to basic disk to regain simpler hard drive management.
Migrate OS to SSD/HD: Migrate OS to another hard drive if you want to back up system or upgrade system disk.
Convert MBR <=> GPT: Convert MBR to GPT to make full use of huge capacity disks when your 3TB hard drive only uses 2TB or convert GPT to MBR safely to get better compatibility.
Convert FAT <=> NTFS: Convert FAT to NTFS to enjoy higher security or convert NTFS to FAT without formatting to get better compatibility.
Extend Partition: Extend partition using disk space on the same drive regardless of whether there is unallocated space on the adjacent right side of the target partition.
Format Partition: Format partition with other file systems like FAT16/32, exFAT, NTFS, Ext2/3/4, and Linux Swap.
Surface Test: Check 3TB hard drive partitions to see whether there are bad sectors or not.
Bootable Media Builder: Create a bootable media to manage 3TB hard drive when your computer fails to boot.
Closing WordDisk Doctor 3 8 – Free Up Disk Spaces For RentCan t mount macintosh hd. Here comes to the end of this post. Reading here, I guess you know the reason that leads to 3TB hard drive only uses 2TB, and the skills to resolve this issue. Besides, we also introduce 10 key features of MiniTool Partition Wizard to help you manage 3TB hard drive better.
Disk Doctor 3 8 – Free Up Disk Spaces DriveNow, it is your turn to have a try. If you have any questions or suggestions on how to use MiniTool software, let us know by typing your questions in the comment section below. Or you can contact us via [email protected]. All ideas are welcome.

OS	Data Disk	System Disk
Window XP 32 bit	Doesn't support GPT partition	Doesn't support GPT partition
Window XP 64 bit	Support GPT partition	Doesn't support GPT partition
Window Vista 32 bit	Support GPT partition	Doesn't support GPT partition
Window Vista 64 bit	Support GPT partition	Support GPT partition, requires UEFI
Window 7 32 bit	Support GPT partition	Doesn't support GPT partition
Window 7 64 bit	Support GPT partition	Support GPT partition, requires UEFI
Window 8 32 bit	Support GPT partition	Doesn't support GPT partition
Window 8 64 bit	Support GPT partition	Support GPT partition, requires UEFI
Window 10 32 bit	Support GPT partition	Doesn't support GPT partition
Window 10 64 bit	Support GPT partition	Support GPT partition, requires UEFI