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AH = 1
Return: AL = status
00h = successful completion
01h = bad command
02h = address mark not found
03h = write attempted on write-protected disk
04h = sector not found
05h = reset failed (hard disk)
06h = diskette changed
07h = parameter act. failed (hard disk)
08h = DMA overrun
09h = DMA across 64K boundary
0Ah = bad sector detected (hard disk)
0Bh = bad track detected (hard disk)
0Ch = unsupported track
10h = bad CRC/ECC
11h = data ECC corrected
20h = controller failure
40h = seek failed
80h = time out
AAh = drive not ready (hard disk)
BBh = undefined error (hard disk)
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