Seagate ST9250827AS, ST9200827AS, ST9160827AS, ST9120817AS Description if bit is set to Bit Word

Word	Description	Value
95–99	ATA-reserved	0000H
100–	Total number of user-addressable LBA sectors available	ST9250827AS = 488,397,168
103	(see Section 2.2 for related information)	ST9200827AS = 390,721,968
		ST9160827AS = 312,581,808
	These words are required for drives that support the 48-bit
		ST9120817AS = 234,441,648
	addressing feature. Maximum value: 0000FFFFFFFFFFFFh.
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.

13Ultra DMA mode 5 is currently active.

Bit Word 93

131 = 80-conductor cable detected, CBLID above VIH 0 = 40-conductor cable detected, CBLID below VIL

28 Momentus 5400.4 SATA Product Manual, Rev. A