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[Solved] Disk Unknown Not Initialized in Windows 10/8/7/2008, How to Fix?

Dec 05, 2017 / Updated by Abby Haines to Resource

Summary:
Here, 4 solutions for disk unknown not initialized error are available: recover data and initialize the hard drive, fix MBR, check and repair disk errors and recover partition. Try them one by one to fix disk 1 or 2 unknown not initialized unallocated space error on your external hard drive in Windows 10, 8, 7, 2008......

Windows 10: Disk 1 is unknown, not initialized, unallocated - external Western Digital hard drive

"When I plug in my external hard drive, Western Digital My Passport 0740 (500GB), it says that it's successfully installed however it does not appear on My Computer. Also when I go into system tools it says that disk 1 is unknown, not initialized, unallocated. Anyone knows how to recover data when hard drive not initialized or how to initialize disk without losing data? I have some important pics on the disk. please help!"

Overview of disk unknown not initialized issue

Like the above cases, "Disk Unknown Not Initialized" issue usually attacks unexpectedly in all the Windows version of Windows 10, 8, 7, 2008 and annoys numerous users. When it happens, your external hard drive may show "unallocated space" or nothing in Disk Management, so you are not able to go access the data on this disk.

Disk Unknown Not Initialized

Disk unknown not initialized issue can be caused by various reasons like virus infection, file system damage, bad sectors, MBR corruption, partition loss, etc. If you can’t figure out the cause, please try the following 4 solutions one by one until the issue is solved successfully!

How to fix Disk Unknown Not Initialized error in Windows 10, 8, 7, 2008......

Recommend: Initialize the hard drive and then recover data 

It is the easiest way to fix disk unknown not initialized issue. Just right-click My Computer --> Manage to run Disk Management, Here, right-click the hard drive and click "Initialize Disk". In the dialog box, select the disk(s) to initialize and choose MBR or GPT partition style.

Initialize the hard drive to fix disk unknown not initialized error

To recover data after fixing disk unknown not initialized error:

Here, if you have important files on the external hard drive, you can try EaseUS free data recovery software to retrieve them back after disk initializing.

1. Connect the external hard drive to PC, launch EaseUS free data recovery software, select the drive and click "Scan" button.
2. The software will soon start a quick scan to find the lost & existing data on the disk. After it completed, a deep scan will automatically launch in order to find more files.
3. After the scan, preview and choose the files you want. Finally, click "Recover" button to retrieve and save them your PC or another disk.

Recover data when hard drive not initialized

Solution 2: Fix or rebuild MBR

1. Download and launch EaseUS free partition software.
2. Select the external hard drive, right-click and select "Rebuild MBR", and then choose the proper Operating System version.
3. Apply the operation to add a pending operation of rebuilding MBR.

Rebuild MBR to fix Disk Unknown Not Initialized error in Windows 10, 8, 7, 2008......

Solution 3: Check and repair bad sectors and disk error

1. Download and launch EaseUS free partition software, right-click the hard drive and click "Check partition".
2. Choose the way that you want to use to check and repair bad sectors: "Check Partition Properties", "Call Windows Chkdsk" or "Surface Test" and Click "OK" to continue.
3. Let the software automatically check and repair bad sectors. And finally, click "OK" to finish the process.

Remove bad sectors to fix Disk Unknown Not Initialized error in Windows 10, 8, 7, 2008......

Solution 4: Make a partition recovery

1. Download and launch EaseUS free partition software, go to Wizard > Partition recovery wizard, click "Next" to open EaseUSPartition recovery wizard.
2. Choose Automatic recovery mode or Manual recovery mode, and click "Next" to make the software search deleted or lost partitions on the hard drive.
3. After searching, select the partitions you want to recover and click "Next" to continue. Finally, click "Proceed" to confirm the recovery operation.