INTERFACE COMMANDS
7 – 11
-W OR D
CONT ENT DESC RIPTION
50
Reserved
51 - 52
Obso lete
53
15 -3 = reserved
2, 1 = the fi elds sup por ted i n wo rd s 88 are vali d, 0 = the fie ld s supp orte d in words 88 a re not vali d
1, 1 = th e fi elds r epo rts in wor d s 64- 70 are vali d, 0 = the fields repo rts i n word s 6 4-70 a re not vali d
0, 1 = th e fi elds r epo rts in wor d s 54- 58 are vali d, 0 = the fields repo rts i n word s 5 4-58 a re not vali d
54
Numb er of cu rre nt logi cal cyli nders
55
Numbe r of curr ent logi ca l hea ds
56
Numb er of l ogi ca l sectors pe r track
57 - 58
C urr e nt capaci ty in sector s
59
15- 9 = re served
8, 1 = multi ple sector se tti ng i s vali d
7- 0 xxh = current se tting fo r numbe r o f se cto rs that c anb e tra nsferr ed per inte r rupt o n Re ad/Wr ite Multip le
co mmand
60 - 61
Tota l nu mber o f user ad dre ssa ble se ctor s (L BA mo de only)
62
ob solete
63
15 -11 = reserved
10 , 1 = Multi -word D MA mode 2 i s selec ted, 0 = Multi -word D MA mode 2 is not selected
9, 1 = Multi -wo rd D MA mode 1 i s selec ted, 0 = Multi -word D MA mode 1 is not selected
8, 1 = Multi -wo rd D MA mode 0 i s selec ted, 0 = Multi -word D MA mode 0 is not selected
7- 3, = re served
2, 1 = Multi -wo rd D MA mode 2 and be low ar e sup por ted
1, 1 = Multi -wo rd D MA mode 1 and be low ar e sup por ted
0, 1 = Multi -wo rd D MA mode 0 i s sup por ted
7-0 = Multi =wor d DMA tra nsfer mod es suppor ted
64
15 -8 = r e serve d, 7- 0 = advance d PIO tr ansfer modes supp or ted
65
Mi ni mum multi -word D MA tra nsfer cycle ti me per word (15-0 = cycle time i n nano seconds )
66
Manufacture r's recomme ded multi- wor d DMA tr ansfer cycle ti me (15-0 = cycle time in nanose conds )
67
Mi ni mum PIO tr ansfer cycle time without flo w contr ol (15 -0 = cycle ti me i n na no seconds )
68
Mi ni mum PIO transfe r cycle time wi th IORDY flow co ntr ol (15-0 = cycle ti me in nanose conds )
69 -74
reserved
75
Que ue depth, 15 -3 = reserved, 4- 0, maxi mum queue de pth - 1
76- 79
reserved
80
Maj or ver sion numbe r
15, r eserve d, 14- 6 = reserved for ATA/ATAPI-14 to ATA/ATAPI-6 r e specti vely
5, 1 = supp or ts ATA/ATAPI-5
4, 1 = supp or ts ATA/ATAPI-4
3, 1 = supports ATA-3
2, 1 = supports ATA-2
1, ob so lete
0, reserved
81
Min or ver sion numbe r
82
C o mmand se t sup po rted. If wo rd s 8 2 and 8 3 = 0000h or FFF Fh c omma nd se t noti fic ati o n no t sup ported.
15 , ob solete
14, 1 = suppor ts the NOP co mmand
13 , 1 = suppor ts the Re ad Buffer comma nd
12 , 1 = sup po rts the Wr ite Buffer comma nd
11 , ob solete
10 , 1 = suppo rts Ho st-Pr otected Are a fe ature set
9, 1 = suppor ts the Device Res et co mma nd
8, 1 = supports Ser vi ce Interupt
7, 1 = s upp orts Release Interup t
6, 1 = sup por ts L ook Ahead
5, 1 = s upp orts Wri te Cache
4, sh al l be cleare d to zero
3, 1 = s upp orts the Powe r M anage ment fea ture co mma nd
2, 1 = s upp orts the Remo vab le Me di a fe ature command
1, 1 = s upp orts the Secur i ty Mo de fe ature co mmand
0, 1 = sup por ts the SMART fe ature set
