Seagate ST9120821AS, ST98823AS, ST96812AS, ST94813AS manual Description if bit is set to Bit Word

Word	Description	Value
93	Hardware reset value	xxxxH
	(see description following this table)
94	Auto acoustic management setting	xxxxH
95–99	ATA-reserved	0000H
100–	Total number of user-addressable LBA sectors available	ST9120821AS = 234,441,648
103	(see Section 2.2 for related information)	ST9100824AS = 195,371,568
		ST98823AS = 156,301,488
	These words are required for drives that support the 48-bit
		ST96812AS = 117,210,240
	addressing feature. Maximum value: 0000FFFFFFFFFFFFh.
		ST94813AS = 78,140,160
		ST93811AS = 58,605,120
104–	ATA-reserved	0000H
127
128	Security status	0001H
129–	Seagate-reserved	xxxxH
159
160–	ATA-reserved	0000H
254
255	Integrity word	xxA5H

Note. See the bit descriptions below for words 63, 88, 93 and 94 of the Identify Drive data:

Description (if bit is set to 1)

Bit Word 63

0Multiword DMA mode 0 is supported.

1Multiword DMA mode 1 is supported.

2Multiword DMA mode 2 is supported.

8Multiword DMA mode 0 is currently active.

9Multiword DMA mode 1 is currently active.

10Multiword DMA mode 2 is currently active.

Bit Word 88

0Ultra DMA mode 0 is supported.

1Ultra DMA mode 1 is supported.

2Ultra DMA mode 2 is supported.

3Ultra DMA mode 3 is supported.

4Ultra DMA mode 4 is supported.

8Ultra DMA mode 0 is currently active.

9Ultra DMA mode 1 is currently active.

10Ultra DMA mode 2 is currently active.

11Ultra DMA mode 3 is currently active.

12Ultra DMA mode 4 is currently active.

28 Momentus 5400.2 SATA Product Manual, Rev. C