INTERFACE COMMANDS
7 – 11-WORD CONTENT DESCRIPTION
50 Reserv ed
51 - 52 Obsolete
53 15-3 = rese rved
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 Numbe r of curr ent lo gi ca l hea ds
56 Number of logical sectors per track
57 - 58 Curre nt ca pac i ty in sect or s
59 15-9 = re se rved
8, 1 = multiple sector se t ti ng 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 obso lete
63 15-11 = re served
10, 1 = Multi-wo rd DM A mode 2 i s se lected , 0 = Multi-w ord D M A mode 2 is no t sele c t ed
9, 1 = Multi-wo rd DM A mode 1 is selec ted, 0 = Multi-w ord D MA mo de 1 is not se lected
8, 1 = M ult i-word DMA mode 0 i s se l ec ted, 0 = Multi-w o rd DM A mode 0 is no t sele c t ed
7-3, = rese rv ed
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 is supported
7-0 = Multi=word DMA transfer modes supported
64 15-8 = r eserve d, 7- 0 = adva nc e d PIO tr a nsfer m o des sup port ed
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 i n nanoseconds)
67 Minimum PIO transfer cycle time without flow control (15-0 = cycle ti me i n nanoseconds)
68 Mini m um P IO transf er cycl e time w i th IORDY fl o w contr ol (15 -0 = cycle time i n nanose conds )
69-74 reserved
75 Queue de p th, 15-3 = res erv ed, 4- 0 , maxi mum queue de pth - 1
76-79 reserved
80 Major v er sion num b er
15, reserved, 14-6 = rese rved for ATA/ATAPI-14 to ATA/ATAPI-6 respecti vely
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 v er sion num b er
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 theWrite 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 = s upport s Write Cache
4, shall be cleared to zero
3, 1 = supports the Power Management feature command
2, 1 = support s th e Remo vab le Me di a fea t ure co mma nd
1, 1 = supports the SecurityMode feature command
0, 1 = supports the SMART feature set