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STATUS_FLOPPY_UNKNOWN_ERROR
The floppy controller returned an unclassified failure
The floppy driver received controller status bits that did not match one of its recognized error mappings. The code therefore preserves a hardware failure without claiming a more specific cause. It can follow unusual command combinations, controller emulation bugs, electrical faults, or multiple simultaneous status conditions.
Collect the raw controller result registers and the command parameters. Replacing the status with a generic retry loses the information needed to identify faulty virtualization or legacy hardware. Compare the same disk and command on another drive or emulator.
What to inspect
- Record all floppy controller result bytes, command, geometry, and retry history.
- Check whether the device is physical, USB-emulated, or provided by a hypervisor.
- Compare with known-good media and a different controller before writing.
References
- Intel 82077AA floppy controller data sheet
- Microsoft: Win32_FloppyDrive
- Microsoft Open Specifications: NTSTATUS values
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