DISK BOOT FAILURE | Boot device not bootable

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Systems & Devices

Canonical

/systems/bios-uefi/error-codes/disk-boot-failure/

Last Updated

Feb 27, 2026

Summary

The selected disk does not contain a valid boot record for the current boot mode.

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What This Code Means

Disk boot failure indicates the system attempted to boot from a disk that does not have a valid bootloader/boot record that matches the configured boot mode. This can occur with newly installed disks, cloned disks, or after partition changes.

Where Users Usually See This Code

After installing a new drive
After cloning or imaging a disk

Why This Code Appears

Boot record missing or corrupted
UEFI/Legacy mode mismatch
Incorrect boot order

What Typically Happens Next

System cannot boot until boot configuration is repaired

What This Code Is Not

It is not a BIOS password prompt
It is not a CPU fan warning

Troubleshooting Checklist

□ Confirm boot order and boot mode
□ Use official recovery media to rebuild boot configuration
□ Back up data before partition/boot repairs

Notes And Edge Cases

Some systems require specific EFI entries in firmware; resetting firmware settings can remove those entries.

Related Codes

8 links

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