Table 11.7-2 Command Code

Command Code

Command Name

Hex Value

 

PARAMETERS USED

 

 

 

 

SC

SN

CY

DRV

HD

FT

Nop

 

00H

X

X

X

O

X

X

Recalibrate

 

1xH

X

X

X

O

X

X

Read Sector(s)

 

20/21H

O

O

O

O

O

X

Read Sector(s) EXT

 

24h

O

O

O

O

O

X

Read DMA EXT

 

25H

O

O

O

O

O

X

Read Native Max Address EXT

 

27H

X

X

X

O

X

X

Read Multiple EXT

 

29H

O

O

O

O

O

X

Write Sector(s)

 

30/31H

O

O

O

O

O

X

Write Sector(s) EXT

 

34H

O

O

O

O

O

X

Write DMA EXT

 

35H

O

O

O

O

O

X

Set Max Address EXT

 

37H

O

O

O

O

O

X

Write Multiple EXT

 

39H

O

O

O

O

O

X

Write Verify

 

3CH

O

O

O

O

O

X

Read Verify Sector(s)

 

40/41H

O

O

O

O

O

X

Read Verify Sector(s) EXT

 

42H

O

O

O

O

O

X

Format Track

 

50H

X

X

O

O

O

X

Seek

 

7xH

X

X

O

O

O

X

Execute Diagnostics

 

90H

X

X

X

O

X

X

Initialize Device Parameters

 

91H

O

X

X

O

O

X

Download Microcode

 

92H

O

O

X

O

X

O

SMART

 

B0H

X

X

O

O

X

O

Device Configuration

 

B1H

X

X

X

O

X

O

Read Multiple

 

C4H

O

O

O

O

O

X

Write Multiple

 

C5H

O

O

O

O

O

X

Set Multiple Mode

 

C6H

O

X

X

O

X

X

Read DMA

 

C8/C9H

O

O

O

O

O

X

Write DMA

 

CA/CBH

O

O

O

O

O

X

Power Control

Stand-by Immediate

E0 / 94H

O

X

X

O

X

X

 

Idle Immediate

E1 / 95H

O

X

X

O

X

X

 

Stand-by

E2 / 96H

O

X

X

O

X

X

 

Idle

E3 / 97H

O

X

X

O

X

X

 

Check Power Mode

E5 / 98H

O

X

X

O

X

X

 

Sleep

E6 / 99H

O

X

X

O

X

X

Read Buffer

 

E4H

X

X

X

O

X

X

Flush Cache

 

E7H

X

X

X

O

X

X

Write Buffer

 

E8H

X

X

X

O

X

X

Flush Cache EXT

 

EAH

X

X

X

O

X

X

Identify Device

 

ECH

X

X

X

O

X

X

Set Features

 

EFH

X

X

X

O

X

O

Security

Set Password

F1H

X

X

X

O

X

X

 

Unlock

F2H

X

X

X

O

X

X

 

Erase Prepare

F3H

X

X

X

O

X

X

 

Erase Unit

F4H

X

X

X

O

X

X

 

Freeze

F5H

X

X

X

O

X

X

 

Disable Password

F6H

X

X

X

O

X

X

Read Native Max Address

 

F8H

X

X

X

O

X

X

Set Max

 

F9H

O

O

O

O

O

X

Read Sence Data

 

FCH

X

X

X

O

X

O

Note: O and X are defined as follows.

O = Must contain valid information for this command.

X = Don't care for this command.

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