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Copyright 1991 David Jurgens |
INT 13,5 - Format Disk Track
AH = 05
AL = interleave value (XT only)
CX = track/cylinder number (see below for format)
DH = head number (0-15 dec.)
DL = drive number (0=A:, 1=2nd floppy, 80h=drive 0, 81h=drive 1)
ES:BX = pointer to block of "track address fields" containing
four byte fields for each sector to be formatted of the form:
1 byte track number
1 byte head number Size #
1 byte sector number Codes Bytes
1 byte sector size code 0 128
1 256
2 512
3 1024
on return:
AH = status (see INT 13,STATUS)
CF = 0 if successful
= 1 if error
- BIOS disk write attempts should reset the controller on error
- INT 13,17 should be called to set the DASD type
- this function is capable of doing great damage if the parameters
are incorrectly specified; only the drive number is checked
- initializes disk address fields and data sectors
- interleave is specified by ordering of track address fields
- after INT 13 disk format, if the disk is to be used with DOS the
DOS data structure must be written
- only the disk number is checked for validity
- the parameters in CX change depending on the number of cylinders;
the track/cylinder number is a 10 bit value taken from the 2 high
order bits of CL and the 8 bits in CH (low order 8 bits of track):
│F│E│D│C│B│A│9│8│7│6│5-0│ CX (cylinder value 0-1023 dec.)
│ │ │ │ │ │ │ │ │ │ └───── unused
│ │ │ │ │ │ │ │ └─┴─────── high order 2 bits of track/cylinder
└─┴─┴─┴─┴─┴─┴─┴────────── low order 8 bits of track/cyl number
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| Esc or Alt-X to exit |
int 13,5 |
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