INTERFACE COMMANDS

-W OR D

CONT ENT DESC RIPTION

 

 

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

C urrent capacity in sectors

59

15- 9 = reserved

 

8, 1 = multiple sector setting is valid

 

7- 0 xxh = current setting for number of sectors that c anbe 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 D MA mode 2 is selec ted, 0 = Multi -word D MA mode 2 is not selected

 

9,

1 = Multi -word D MA mode 1 is selec ted, 0 = Multi -word D MA mode 1 is not selected

 

8,

1 = Multi -word D MA mode 0 is selec ted, 0 = Multi -word D MA mode 0 is not selected

 

7- 3, = reserved

 

2,

1 = Multi -word D MA mode 2 and below are supported

 

1,

1 = Multi -word D MA mode 1 and below are supported

 

0,

1 = Multi -word D MA mode 0 is supported

 

7-0 = Multi=word DMA transfer modes supported

64

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

65

Minimum multi -word D MA 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

reserved

75

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

 

 

76- 79

reserved

 

 

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

C ommand set supported. If words 82 and 83 = 0000h or FFF Fh c ommand set notific ation 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 Res et command

 

8, 1 = supports Service Interupt

 

7, 1 = s upports Release Interupt

 

6, 1 = supports Look Ahead

 

5, 1 = s upports Write Cache

 

4, shall be cleared to zero

 

3, 1 = s upports the Power M anagement feature command

 

2, 1 = s upports the Removable Media feature command

 

1, 1 = s upports the SecurityMode feature command

 

0, 1 = supports the SMART feature set

7 – 11

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Maxtor 51536H2, 52049H3, 53073H4, 546106 specifications Or D