How do I fix an unallocated external hard drive?

Right-click on This PC/My Computer > Manage > Disk Management.

1. Step 2: Locate and right-click on the unallocated space of the external hard drive, select "New Simple Volume".
2. Step 3: Set partition size, drive letter and file system (NTFS), etc.
3. Step 4: Click "Finish" to complete the process.

Jan 18, 2022