Low
Operating Systems
✓ Solution Verified by Community (0+ upvotes)
Error Code error-not-ready — Windows 11
ERROR_NOT_READY = 21
Oprava založena na komunitních zprávách a expertní analýze. Naposledy ověřeno: 2026-08-12
· Jak ověřujeme opravy
| Error Code | error-not-ready |
|---|---|
| Affected System | Windows 11 (Microsoft) |
| Difficulty | Low |
| Estimated Time | 15 min |
Postup řešení
- 1 First, safely eject the drive and reinsert it. Click the 'Safely Remove Hardware' icon in the system tray (bottom-right corner, may be hidden behind an arrow), select your device, and wait for the 'Safe to Remove Hardware' message. Then unplug and plug it back in. This resets the connection and often fixes the 'not ready' state.
- 2 Try a different USB port. Plug the drive into another port, preferably directly on the motherboard (back of the PC) rather than a front panel or hub. Some ports may not provide enough power or have driver issues, causing the drive to not initialize properly.
- 3 Open Disk Management to check if the drive is recognized. Press Windows key + X and select 'Disk Management' from the menu. Look for your drive (it may show as 'Removable' or with a drive letter). If it appears as 'Unallocated' or 'No Media', the drive may be faulty or not inserted properly. If it shows as 'Online', right-click and select 'Change Drive Letter and Paths' to assign a new letter.
- 4 Update the drive's driver. Press Windows key + X and select 'Device Manager'. Expand 'Disk drives', right-click your drive, and select 'Update driver'. Choose 'Search automatically for drivers'. This ensures Windows has the latest driver, which can fix communication issues.
- 5 If the drive is an external HDD or SSD, check the cable and connection. Try a different cable (if possible) and ensure the connector is firmly seated. A loose or damaged cable can cause intermittent 'not ready' errors.
- 6 As a last resort, if the drive is new and empty, you can format it. In File Explorer, right-click the drive and select 'Format'. Choose a file system (NTFS for Windows, exFAT for compatibility) and click 'Start'. This will erase all data, so only do this if you don't need anything on it.
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