Disk Not Validated
Commodore Amiga
Severity: ModerateWhat Does This Error Mean?
Disk Not Validated means AmigaOS detected that the filesystem on the floppy disk was not properly closed last time it was written. The disk may still be readable. Double-click it to trigger validation, or use DiskSalv to recover data.
Affected Models
- Commodore Amiga 500
- Commodore Amiga 500+
- Commodore Amiga 600
- Commodore Amiga 1200
- WinUAE emulator
Common Causes
- Disk was removed from the drive while the Amiga was still writing to it
- Power was cut while a write operation was in progress
- Floppy disk has bad sectors preventing the filesystem from closing cleanly
- Disk hit (wrote to) during an unexpected reset or crash
How to Fix It
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Double-click the disk icon on the Workbench to trigger automatic validation.
AmigaOS validates a disk automatically when you open it. If validation succeeds, the Not Validated warning disappears and the disk works normally. This works for most minor filesystem flag issues.
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Open a Shell and run: Validate DF0: (or DF1: for the second drive).
The Validate command explicitly checks and repairs the filesystem. Type: Validate DF0: and press Return. If it reports errors it cannot fix, use a disk repair tool.
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Use DiskSalv to recover data from a disk that cannot be validated.
DiskSalv is the classic Amiga disk recovery tool. It can read data from damaged or partially unvalidated disks and copy it to a good disk. Available as freeware on Aminet.
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On WinUAE: check the disk image in an ADF editor for filesystem integrity.
Tools like reADFaust or AFC can inspect ADF images and repair filesystem issues at the image level.
Frequently Asked Questions
Will my files be lost if a disk shows Not Validated?
Not necessarily. The files are usually still on the disk — the filesystem just was not cleanly closed. Validation repairs the metadata. Most files survive intact.
How do I prevent disk corruption on the Amiga?
Always wait for the drive light to go out before removing a disk. Never remove a disk mid-write, and never reset the Amiga while the drive is active.