Bad sector detected Bad track detected Unsupported track Invalid number of sectors on format Control data address mark detected DMA arbitration level out of range Bad CRC/ECC on disk read CRC/ECC corrected data error Controller has failed No media in drive Incorrect drive type stored in CMOS

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In both of these functions, the data is read into and written from buffer at 512 bytes per sector that is the logical size of sector of a hard disk and the value returned by both functions is the value of the AX register set by the INT 0x13H BIOS call.

If the function is successful, High byte = 0, that means the successful completion and low byte contains the number of sectors read, written or verified and so on.

But if there is any error and function is not successful, the value of High byte will be one of the following error codes which are described in the following table:


Value

Description

0x00

Successful completion (Not an Error!!)

0x01

Bad command

0x02

Address mark not found

0x03

Attempt to write to write-protected disk

0x04

Sector not found

0x05

Reset failed (hard disk)

0x06

Disk changed since last operation

0x07

Drive parameter activity failed

0x08

Direct memory access (DMA) overrun

0x09

Attempt to perform DMA across 64K boundary
(data Boundary error or >80H sectors)

0x0A

Bad sector detected

0x0B

Bad track detected

0x0C

Unsupported track

0x0D

Invalid number of sectors on format (PS/2 hard disk)

0x0E

Control data address mark detected (hard disk)

0x0F

DMA arbitration level out of range (hard disk)

0x10

Bad CRC/ECC on disk read

0x11

CRC/ECC corrected data error (Not an error actually)

0x20

Controller has failed

0x31

No media in drive (IBM/MS INT 13 extensions)

0x32

Incorrect drive type stored in CMOS (Compaq)

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