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Detecting Disk Ready
Use INT 13 function 4 (Verify Sector) to check ready for read
Check for error in AH of:
80h Time out, or Not Ready
AAh Drive not ready
00h drive is ready for reading
other value indicates drive is ready, but an error occurred
Use INT 13 functions 2 (Read Sector) and 3 (Write Sector) to check
ready for read/write. Read sector, test for ready. Write sector
back, check for 03h (write protect) or any of the other BIOS disk
errors.
- multiple attempts should be made to allow for disk motor startup
- allows testing of drive ready bypassing DOS and critical error
- see INT 13/2 INT 13/3 INT 13/4 and INT 13/STATUS |
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