BIOS / UEFI Error Code
Systems & Devices
BIOS / UEFI
A DISK READ ERROR OCCURRED | Disk read failure
Industry
Systems & Devices
Canonical
/systems/bios-uefi/error-codes/a-disk-read-error-occurred/
Last Updated
Feb 27, 2026
Summary
The system failed to read from the boot disk during early boot.
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What This Code Means
This boot message indicates a read operation from the boot device failed. Causes include drive failure, cable/connector issues, filesystem corruption, or a damaged boot sector.
Where Users Usually See This Code
- Immediately after POST
- After sudden power loss or disk write interruption
Why This Code Appears
- Failing drive or bad sectors
- Loose SATA cable or unstable power (desktop)
- Boot sector or filesystem corruption
What Typically Happens Next
- System will not boot until disk health/boot structure is addressed
What This Code Is Not
- It is not a GPU/monitor error
- It is not a network boot message
Troubleshooting Checklist
- □ Back up data if possible using recovery media
- □ Check drive health diagnostics and SMART status
- □ Reseat cables on desktops where applicable
- □ Use official repair tools for boot configuration
Notes And Edge Cases
Repeated disk read errors are a warning sign for drive failure; prioritize data recovery.
Related Codes
8 links
- BOOT FAILURE CodeInsert system disk
- PXE BOOT FAILED CodeNetwork boot fallback
- BOOTMGR IS MISSING CodeBoot loader missing
- INVALID PARTITION TABLE CodeBoot partition issue
- NTLDR IS MISSING CodeLegacy boot loader missing
- PRESS ANY KEY TO BOOT CodeBooting from external media
- PXE-E61: MEDIA TEST FAILURE CodeNetwork boot attempted
- REBOOT AND SELECT PROPER BOOT DEVICE CodeWrong boot device
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