If you can’t assign a drive letter in Disk Management, you can choose a professional and reliable disk management tool to change the drive letter. Assign a New Drive Letter With MiniTool Partition Wizard So, when the drive letter is occupied by another drive, it may be unavailable.

Each drive letter can only be used once on one computer at a time. The drive letter is permanently assigned to another drive or partition.When the removable drive is connected to the computer, it will be automatically assigned the first unused drive letter, but sometimes even if you remove the drive from your PC, the drive letter is still reserved, resulting in the drive letter not available issue. The drive letter is used by a hidden removable drive.Why does the “drive letter not available” error occur? So, the Windows 10 drive letter not available error message will prevent you from accessing the files saved on the target drive. If a hard drive does not have a drive letter assigned, it will be inaccessible. You can view the drive letter of each drive in Disk Management and File Explorer. Bonus Time – How to Recover Data After Changing the Drive LetterĪ drive letter is a letter identifier assigned to a disk storage device in DOS (Disk Operating System) and Windows systems.How to Fix Drive Letter Not Available in Windows 10/11.Facing the “ drive letter not available” issue? Now in this post from MiniTool, you can see how to fix the drive letter not available error message and what should you do when you can’t assign a drive letter in Disk Management.

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