Function writes sectors from memory to disk INT 13H (0x13) Function 0BH (0x0B or 11) Write sector long supported on fixed disks only Function 0CH (0x0C or 12) Seek

 
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This function is supported on fixed disks only. The upper 2 bits of the 10-bit cylinder number are placed in the upper 2 bits of register CL.

INT 13H (0x13)

Function 0BH (0x0B or 11) >> Write sector long

Call with:AH = 0BH
AL = number of sectors
CH = cylinder
CL = sector
DH = head
DL = drive
80H-FFH fixed disk
ES: BX = segment: offset of buffer

 

Returns:If function successful
Carry flag = clear
AH = 00H
AL = number of sectors transferred

If function unsuccessful
Carry flag = set
AH = status

Comments:

This function writes a sector(s) from memory to disk. Each sector’s worth of data must be followed by its 4-byte ECC code. The upper 2 bits of the 10-bit cylinder number are placed in the upper 2 bits of register CL. This function is supported on fixed disks only.

INT 13H (0x13)

Function 0CH (0x0C or 12) >> Seek

Call with:AH = 0CH
CH = lower 8 bits of cylinder
CL = upper 2 bits of cylinder in bits 6-7
DH = head
DL = drive
80H-FFH fixed disk

Returns:If function successful
Carry flag = clear
AH = 00H

If function unsuccessful
Carry flag = set
AH = status

Comments:

This function positions the disk read/write heads to the specified cylinder without transferring any data. The upper 2 bits of the cylinder number are placed in the upper 2 bits of register CL. This function is supported on fixed disks only.

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