How to fix error error-not-dos-disk in Windows 11

Solution Steps

1. 1 First, try a different USB port or a different computer. This helps determine if the issue is with the disk itself or the port. If the disk works elsewhere, the problem might be with your USB controller or drivers. If it doesn't work anywhere, the disk is likely the issue.
2. 2 Open Disk Management by pressing Windows key + X and selecting 'Disk Management' from the menu. Look for your disk (it may show as 'Unknown' or 'Not Initialized'). If the disk is not initialized, right-click it and choose 'Initialize Disk'. This sets up a basic partition structure that Windows can read.
3. 3 If the disk is initialized but has no file system, right-click the unallocated space and choose 'New Simple Volume'. Follow the wizard to format the disk with NTFS (or exFAT if you need compatibility with Mac/Linux). This will erase all data, so only do this if you don't need the files.
4. 4 If the disk shows as 'RAW' or has a file system that Windows doesn't recognize, you can use Command Prompt to attempt a repair. Press Windows key + R, type 'cmd', and press Ctrl+Shift+Enter to run as administrator. Type 'chkdsk X: /f' (replace X with the drive letter) and press Enter. This checks for file system errors and attempts to fix them.
5. 5 If chkdsk fails, you may need to format the disk. In Disk Management, right-click the partition and choose 'Format'. Select NTFS and perform a full format (uncheck 'Quick Format'). This will completely erase the disk but will also create a fresh, readable file system.