disk f disappeared

If drive F: disappeared, the most common possibilities are:

1. The partition still exists but has no drive letter. In Disk Management, if the volume is healthy but missing a letter, add a drive letter manually.
2. The disk is showing as Offline or Missing in Disk Management. If so, try Reactivate Disk or bring it Online.
3. If it was an external drive, it may be disconnected, underpowered, or have a cable/USB port problem. Unplug and reconnect it, then in Disk Management select Action > Rescan Disks. Also try a different USB port or cable.
4. If the disk shows as Not Initialized, RAW, or Unallocated, the disk may have corruption or hardware problems. Do not format it if files need to be recovered, because formatting erases data.
5. In some cases, an F: drive can be an EFI partition that became visible and later disappeared again. EFI and Recovery partitions contain important system files and should be left alone.

A safe way to check what happened:

1. Right-click Start > Disk Management.
2. Look for the missing disk or volume.
3. If it is Healthy but has no letter, add a drive letter.
4. If it is Offline, set it Online or use Reactivate Disk.
5. If it is an external disk and not showing correctly, reconnect it, rescan disks, then try another USB port or cable.
6. If it shows RAW, Unallocated, or Not Initialized and the data matters, avoid formatting or creating a new volume.

References:

• Troubleshoot Disk Management
• Accidentaly partitioned a drive - Microsoft Q&A