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Word Description Contents
27–46
Drive model number: (40 ASCII characters,
padded with blanks to end of string)
ST92255AG or
ST91685AG
47
Maximum sectors per interrupt on read/write
multiple
0010
H
48 Double word I/O (not supported) 0000
H
49
Standby timer values supported per ATA
standard, IORDY supported, IORDY can
be disabled
2C00
H
50 ATA-reserved 0000
H
51 PIO data-transfer cycle timing mode 0200
H
52 DMA transfer cycle timing mode (not used) 0000
H
53
Validity of words 54–58 and words 64–70
(words may be valid)
0003
H
54
Number of cylinders
(current emulation mode)
xxxx
H
55
Number of heads
(current emulation mode)
xxxx
H
56
Number of sectors per track
(current emulation mode)
xxxx
H
57–58 Number of sectors (current emulation mode)
xxxx
H
59
Number of sectors transferred during a Read
Multiple or Write Multiple command
01
xx
H
60–61 LBA sectors available
(ST92255AG)
0FBC 0043H
(ST91685AG)
017FC 0032H
62 ATA obsolete 0000
H
63
Multiword DMA active/modes supported
(see note following)
0
x
07
H
64
Advanced PIO modes supported (modes 3
and 4 supported)
0003
H
continued from previous page
30 Marathon 2250 and Marathon 1680 Product Manual