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The MS-DOS Encyclopedia
Appendix B: Critical Error Codes
Critical errors are returned via Interrupt 24H. If register AL bit 7
is 0, then the error was a disk error; if register AL bit 7 is 1, then
the error was a nondisk error. The upper half of DI is undefined; the
lower half of DI contains one of the following error-condition codes:
╓┌──────────────┌────────────────────────────────────────────────────────────╖
Code Description
──────────────────────────────────────────────────────────────────
00H Attempt to write on write-protected disk
01H Unknown drive or unit
02H Drive not ready
03H Invalid command
04H Data error (CRC failed)
05H Bad request structure length
06H Seek error
07H Unknown media type
08H Sector not found
09H Printer out of paper
0AH Write fault
0BH Read fault
0CH General failure
0FH Invalid disk change
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