INT 13H (0x13) Function 07H (0x07) Format drive 08H (0x08) Get drive parameters

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INT 13H (0x13)

Function 07H (0x07) >> Format drive

Call with: AH = 07H
AL = interleave
CH = cylinder
DL = drive
80H-FFH fixed disk

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

If function unsuccessful
Carry flag = set
AH = status (see the status table given
earlier)

Comments:
This function is defined for PC/XT fixed disk drives only. It formats the entire drive, writing disk address fields and data sectors, starting at the specified cylinder.

INT 13H (0x13)

Function 08H (0x08) >> Get drive parameters

Call with: AH = 08H
DL = drive
00H-7FH floppy disk
80H-FFH fixed disk

Returns: If function successful
Carry flag = clear
BL = drive type (PC/AT and PS/2 floppy
disk)

Value

Description

01H

360KB, 40 track, 5.25”

02H

1.2MB, 80 track, 5.25”

03H

720KB, 80 track, 3.5”

04H

1.44MB, 80 track, 3.5”

CH = low 8 bits of maximum cylinder
number
CL = bits 6-7 high order 2 bits of maximum
cylinder number bits 0-5 maximum
sector number
DH = maximum head number
DL = number of drives
ES: DI = segment: offset of disk drive
parameter table

If function unsuccessful
Carry flag = set
AH = status

Comments:
This function returns various parameters for the specified drive. The value returned in register DL reflects the true number of physical drives attached to the adapter for the requested drive.

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Data Recovery with & without Programming


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540
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