USB device not recognized on Windows 11: fix the connection, protect your files

Two different problems

“Not recognized” can mean two things, and the fix differs:

• Windows can’t talk to the device (a popup like “USB device not recognized”, “The last USB device you connected to this computer malfunctioned”, or an Unknown USB Device in Device Manager). This is the connection, power or driver.
• Windows sees the drive but can’t read it (“You need to format the disk”, RAW, or 0 bytes). This is the file system. See “You need to format the disk” in Windows: don’t format it and RAW drive in Windows: files and fixes.

Steps that don’t change your data

1. Different port and cable. Plug directly into a port on the PC, not a hub or front panel, and try another cable. Remove other USB devices.
2. Try another computer. If the drive fails everywhere, it is the drive.
3. Restart Windows with the device unplugged, then plug it in.
4. Device Manager. Right-click Start > Device Manager. Look under Disk drives, Universal Serial Bus controllers and Other devices for an Unknown USB Device or a yellow warning. Right-click the device > Properties shows the status or error code. Code 43 suggests the device reported a problem, which may be a bad cable, port or device.
5. Uninstall and rescan. Right-click the problem device > Uninstall device (this removes the driver entry, not your files), unplug, restart and plug it back in. Windows reinstalls the driver.
6. Turn off USB selective suspend. Settings > System > Power & battery, or Control Panel > Power Options > Change plan settings > Change advanced power settings > USB settings > USB selective suspend setting > Disabled. Selective suspend lets Windows power down idle ports, and can make some drives drop.
7. Windows Update and chipset drivers. Install pending updates; on desktops, update the motherboard’s USB/chipset drivers from the maker’s site.
8. Power for spinning drives. A bus-powered portable hard drive can need more current than a port gives. Use a powered hub or the PC’s rear ports.

When the drive appears in Disk Management

Press Windows+X and choose Disk Management. If the disk is listed:

• “Offline”: right-click it > Online. This changes a flag, not your files.
• Healthy partition without a drive letter: right-click > Change Drive Letter and Paths > Add. This is also safe.
• “Not Initialized” or “Unallocated” on a disk that held files: don’t initialize or create a new volume. Those write. Copy the files off first.
• RAW or a format prompt: don’t format.

chkdsk: plain chkdsk E: only reports; /f and /r repair, so they write to the drive (Microsoft Learn). Not before your files are safe.

Copy your files off with Retrova

Once Windows lists the drive as a disk, even one it can’t open, Retrova can read it. It opens it read-only, so nothing is formatted, repaired or initialised. It understands NTFS, exFAT, FAT12/16/32, APFS, Mac OS Extended (HFS+), ext2/3/4, XFS and Btrfs.

1. Plug the drive in and open Retrova. On the home screen choose A drive won’t open. Retrova lists every drive and partition it can see, with the file system it detected.
2. Pick the drive or partition. Windows asks for administrator permission, because reading a disk directly needs it.
3. Browse and choose what you want back. If the file system is readable you see your original folders and file names, and you can preview photos, videos, PDFs and text before copying.
4. Choose a destination on a different drive with enough free space. Retrova never saves onto the drive it is reading.
5. Copy, then Verify. Files are written as temporary parts and renamed only when complete. When it finishes, run Verify to compare every copy with the original, byte for byte.

If no file system is recognised, or the one it finds is too damaged to list files, run Deep scan from I deleted something. Deep scan ignores the file system and searches the raw drive for the start of 72 known file types (photos including camera RAW, videos, audio, documents, archives, mail files and more). It only recovers files that were stored in one piece, and the original names and folders are lost: finds come back sorted by type with new names.

If Windows doesn’t list the drive at all, in Device Manager, Disk Management, or diskpart > list disk, Retrova can’t reach it either. Try another computer; if none sees it, the hardware has failed, and a data recovery lab is the realistic option.

What Retrova can’t do: it can’t undelete files with their names on APFS, ext or other file systems (only NTFS, FAT and exFAT), can’t open an encrypted drive without its password or recovery key, can’t open the startup disk of a T2 or Apple silicon Mac away from that Mac, doesn’t handle RAID sets or phones, and can’t fix a drive with physical damage. Retrova’s builds aren’t signed or notarised yet, so macOS and Windows will show a warning the first time you open it.

What not to do

Questions

Sources

• Microsoft Learn: chkdsk
• Microsoft Learn: diskpart

Related guides

• “You need to format the disk” in Windows: don’t format itCancel the prompt and copy your files off first.
• RAW drive in Windows: files and fixesWhy chkdsk says it is not available for RAW drives.
• Free USB drive recoveryDeleted, formatted or unreadable USB drive: what to do.
• Recover files from a failing hard drive: image it firstSlow, clicking or disconnecting? Copy the healthy data first, then recover from the image.