Datasheet
Hitachi Global Storage Technologies
Page 4 version 1.0
Command descriptions
The following commands are sup-
ported by the drive:
Commands (Hex) P
Check Power Mode E5 3
Check Power Mode* 98 3
Execute Device
Diagnostic
90 3
Flush Cache E7 3
Format Track 50 2
Identify Device EC 1
Idle E3 3
Idle* 97 3
Idle Immediate E1 3
Idle Immediate* 95 3
Initialize Device
Parameters
91 3
NOP 00 3
Read Buffer E4 1
Read DMA (retry) C8 4
Read DMA (no retry) C9 4
Read DMA Queued C7 5
Read Long (retry) 22 1
Read long (no retry) 23 1
Read Multiple C4 1
Read Native Max
Address
F8 3
Read Sectors (retry) 20 1
Read Sectors (no
retry)
21 1
Read Verify Sectors
(retry)
40 3
Read Verify Sectors
(no retry)
41 3
Recalibrate 1x 3
Security Disable
Password
F6 2
Security Erase
Prepare
F3
3
Security Erase Unit F4
2
Security Freeze Lock F5
3
Security Set
Password
F1
2
Security Unlock F2
2
Seek 7x
3
Service A2
5
Set Features EF
3
Set Max Address F9
3
Set Multiple Mode C6
3
Sleep E6
3
Sleep* 99
3
SMART Disable
Operations
B0
3
S.M.A.R.T. Enable/
Disable Attribute Auto
save
B0
3
S.M.A.R.T. Enable
Operations
B0
3
S.M.A.R.T. Execute
Off-line Data
Collection
B0
3
S.M.A.R.T. Read
Attribute Values
B0
1
S.M.A.R.T. Read
Attribute Thresholds
B0
1
S.M.A.R.T. Return
Status
B0
3
S.M.A.R.T. Save
Attribute Values
B0
3
S.M.A.R.T. Read Log
Sector
B0
1
S.M.A.R.T. Write Log
Sector
B0
2
S.M.A.R.T. Enable/
Disable Automatic
Off-line Data
Collection
B0 3
Standby E2 3
Standby* 96 3
Standby Immediate E0 3
Standby Immediate* 94 3
Write Buffer E8 2
Write DMA (retry) CA 4
Write DMA (no retry) CB 4
Write DMA Queued CC 5
Write Long (retry) 32 2
Write Long (no retry) 33 2
Write Multiple C5 2
Write Sectors (retry) 30 2
Write Sectors (no
retry)
31 2
Protocol
1 PIO data IN command
2 PIO data OUT command
3 Non data command
4 DMA command
5 DMA queued command
+ Vendor specific command
Note: Commands marked * are alternate
command codes for previously defined
commands
Signal definition
Pin Signal I/O Type
01 RESET– I (2)
02 GND – –
03 DD7 I/O (1)
04 DD8 I/O (1)
05 DD6 I/O (1)
06 DD9 I/O (1)
07 DD5 I/O (1)
08 DD10 I/O (1)
09 DD4 I/O (1)
10 DD11 I/O (1)
11 DD3 I/O (1)
12 DD12 I/O (1)
13 DD2 I/O (1)
14 DD13 I/O (1)
15 DD1 I/O (1)
16 DD14 I/O (1)
17 DD0 I/O (1)
18 DD15 I/O (1)
19 GND – –
(20) Key – –
21 DMARQ O (1)
22 GND – –
23 DIOW–(**) I (2)
24 GND – –
25 DIOR–(**) I (2)
26 GND – –
27 IORDY(**) O (1)
28 CSEL I (2)
29 DMACK– I (2)
30 GND – –
31 INTRQ O (1)
32
33 DA1 I (2)
34 PDIAG– I/O (3)
35 DA0 I (2)
36 DA2 I (2)
37 CS0– I (2)
38 CS1– I (2)
39 DASP– I/O (3)
40 GND – –
Notes:
Type:
(1) 3-state
(2) TTL
(3) open-collector or open drain
output
O – an output from the drive.
I - an input to the drive.
"I/O" designates an input/output common.
The signal lines marked with (**) are re-
defined during the Ultra DMA protocol to
provide special functions. These lines
change from the conventional to special
definitions at the moment the Host de-
cides to allow a DMA burst if the Ultra
DMA transfer mode was previously
chosen by means of SetFeatures. The
Drive
becomes aware of this change
upon assertion of the DMACK– line.
These lines revert back to their original