How to Fix an Uninitialized and Unallocated Disk on Windows?

Step 1: Download and install the right version of iBoysoft Data Recovery for your Windows PC.

Step 2: Launch iBoysoft Data Recovery and choose the drive from which you lost your photos.

Step 3: After clicking the Next button, iBoysoft Data Recovery will start searching for all deleted or lost photos.

Step 4: You are allowed to click Preview to check the scanning results, choose the photos you want to get back, and then click the "Recover" button. 

Step 5: Save the recovery results to a new location.

As you have recovered your lost photos, you can either rebuild MBR or initialize the disk to fix the "uninitialized and unallocated" error.

Fix 1: Rebuild MBR

Open a Command Prompt, and type the following command lines:

bootrec/fixmbr

bootrec/fixboot

Fix 2: Initialize the hard disk

Step 1: Right-click My Computer and Select Manage, then locate and open Disk Management.

Step 2: Right-click your external disk and then click the Initialize Disk option.

Step 3: Select MBR partition style (Master Boot Record) and then click the OK button.

Step 4: Select and right-click the unallocated space on the drive and then choose New Simple Volume.

Step 5: Select Next, specify the size of the volume, and then select Next.

Step 6: Specify the drive letter and then click Next.

Step 7: Specify the file system you want to use (usually NTFS), select Next, and then click Finish.    

For more information about the uninitialized and unallocated disk, read the following articles:

Disk Unknown Not Initialized error: Why and How to Fix? 

Hard Drive Shows As Unallocated on Windows 10, How to Fix