Serial ATA Interface

www.seagate.com

Table 8

Identify Device commands (continued)

 

 

 

 

 

Word

 

Description

Value

 

 

 

 

47

 

(Bits 7–0) Maximum sectors per interrupt on Read multiple and

8010H

 

 

Write multiple (16)

 

 

 

 

 

48

 

Reserved

0000H

 

 

 

 

49

 

Standard Standby timer, IORDY supported and may be disabled

2F00H

 

 

 

 

50

 

ATA-reserved

4000H

51

 

PIO data-transfer cycle timing mode

0200H

 

 

 

 

52

 

Retired

0200H

 

 

 

 

53

 

Words 54–58, 64–70 and 88 are valid

0007H

54

 

Number of current logical cylinders

xxxxH

 

 

 

 

55

 

Number of current logical heads

xxxxH

 

 

 

 

56

 

Number of current logical sectors per logical track

xxxxH

57–58

 

Current capacity in sectors

xxxxH

 

 

 

 

59

 

Number of sectors transferred during a Read Multiple

xxxxH

 

 

or Write Multiple command

 

 

 

 

 

60–61

 

Total number of user-addressable LBA sectors available

0FFFFFFFh*

 

 

(see Section 2.2 for related information)

 

 

 

*Note: The maximum value allowed in this field is: 0FFFFFFFh

 

 

 

(268,435,455 sectors, 137 Gbytes). Drives with capacities over

 

 

 

137 Gbytes will have 0FFFFFFFh in this field and the actual num-

 

 

 

ber of user-addressable LBAs specified in words 100-103. This is

 

 

 

required for drives that support the 48-bit addressing feature.

 

 

 

 

 

62

 

Retired

0000H

63

 

Multiword DMA active and modes supported

xx07H

 

 

(see note following this table)

 

 

 

 

 

64

 

Advanced PIO modes supported (modes 3 and 4 supported)

0003H

 

 

 

 

65

 

Minimum multiword DMA transfer cycle time per word (120 nsec)

0078H

 

 

 

 

66

 

Recommended multiword DMA transfer cycle time per word

0078H

 

 

(120 nsec)

 

 

 

 

 

67

 

Minimum PIO cycle time without IORDY flow control (240 nsec)

0078H

68

 

Minimum PIO cycle time with IORDY flow control (120 nsec)

0078H

69–74

 

ATA-reserved

0000H

 

 

 

 

75

 

Queue depth

001FH

76

 

Serial ATA capabilities

xxxxH

77

 

Reserved for future Serial ATA definition

xxxxH

 

 

 

 

78

 

Serial ATA features supported

xxxxH

79

 

Serial ATA features enabled

xxxxH

 

 

 

 

80

 

Major version number

01F0H

 

 

 

 

34

Video 3.5 HDD Product Manual, Rev. H

Page 34
Image 34
Seagate ST4000VM000 manual XxxxH