A USB drive may disappear after a Windows update because the USB driver changed, the drive letter was removed, the file system became RAW, or the device has a connection problem. Do not format it if important files are still on the USB drive.

If the USB drive appears in Disk Management as RAW, unallocated, or asks to format, recover files first with Qiling Data Recovery.
Step 1. Open Qiling Data Recovery and select a recovery mode.

Step 2. Select the USB drive and scan it.

Step 3. Filter and preview files, then recover them to another disk.

After your files are safe, assign a drive letter, run a file system check, or format the USB drive to a suitable file system. If the USB is write-protected, use this guide: write protected USB format tool for Windows 11.
When a USB drive is not showing after Windows update, separate detection checks from data recovery. Recover files first if the drive is visible but inaccessible, then repair or format it.