INTERFACE COMMANDS

- W O R D

CONTENT DESCRIPTION

50

Reserved

51 - 52

Obsolete

53

15 -3 = reserved

 

2, 1 = the fields supported in words 88 are valid, 0 = the fields supported in words 88 are not valid

 

1, 1 = the fields reports in words 64-70 are valid, 0 = the fields reports in words 64-70 are not valid

 

0, 1 = the fields reports in words 54-58 are valid, 0 = the fields reports in words 54-58 are not valid

54

Number of current logical cylinders

55

Number of current logical heads

56

Number of logical sectors per track

57 - 58

Current capacity in sectors

59

15-9 = reserved

 

8, 1 = multiple sector setting is valid

 

7-0 xxh = current setting for number of sectors that canbe transferred per interrupt on Read/Write Multiple

 

command

60 - 61

Total number of user addressable sectors (LBA mode only)

62

obsolete

63

15 -11 = reserved

 

10, 1 = Multi-word DMA mode 2 is selected, 0 = Multi-word DMA mode 2 is not selected

 

9,

1 = Multi-word DMA mode 1 is selected, 0 = Multi-word DMA mode 1 is not selected

 

8,

1 = Multi-word DMA mode 0 is selected, 0 = Multi-word DMA mode 0 is not selected

 

7-3, = reserved

 

2,

1 = Multi-word DMA mode 2 and below are supported

 

1,

1 = Multi-word DMA mode 1 and below are supported

 

0,

1 = Multi-word DMA mode 0 i s supported

 

7-0 = Multi=word DMA transfer modes supported

64

15-8 = reserved, 7-0 = advanced PIO transfer modes supported

65

Minimum multi-word DMA transfer cycle time per word (15-0 = cycle time in nanoseconds)

66

Manufacturer's recommeded multi-word DMA transfer cycle time (15-0 = cycle time in nanoseconds)

67

Minimum PIO transfer cycle time without flow control (15-0 = cycle time in nanoseconds)

68

Minimum PIO transfer cycle time with IORDY flow control (15-0 = cycle time in nanoseconds)

69-74

r eserved

75

Queue depth, 15 -3 = reserved, 4-0, maximum queue depth - 1

76-79

r eserved

80

Major version number

 

15, reserved, 14 -6 = reserved for ATA/ATAPI-14 to ATA/ATAPI-6 respectively

 

5, 1 =

supports ATA/ATAPI-5

 

4, 1 =

supports ATA/ATAPI-4

 

3, 1 = supports ATA-3

 

2, 1 = supports ATA-2

 

1, obsolete

 

0, reserved

81

Minor version number

82

Command set supported. If words 82 and 83 = 0000h or FFFFh command set notification not supported.

 

15, obsolete

 

14, 1 = supports the NOP command

 

13, 1 = supports the Read Buffer command

 

12, 1 = supports the Write Buffer command

 

11, obsolete

 

10, 1 = supports Host-Protected Area feature set

 

9, 1 = supports the Device Reset command

 

8, 1 = supports Service Interupt

 

7, 1 = supports Release Interupt

 

6, 1 = supports Look Ahead

 

5, 1 = supports Write Cache

 

4, shall be cleared to zero

 

3, 1 = supports the Power Management feature command

 

2, 1 = supports the Removable Media feature command

 

1, 1 = supports the Security Mode feature command

 

0, 1 = supports the SMART feature set

7 – 11

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Maxtor 96147H8, 93073H4, 91536H2, 94610H6, 92305H3 specifications 15 -3 = reserved