9.18.2.1.3Key Sector Format

An SCT command (Key Sector) is always 512 bytes long. Table below shows the generic format of an SCT command.

Byte

Field

Words

Description

1:0

Action Code

1

This field defines the command type and

 

 

 

generally specifies the type of data being

 

 

 

accessed, such as sector or physical action

 

 

 

being performed, such as seek.

3:2

Function Code

1

This field specifies the type of access, and

 

 

 

varies by command. For example, this can

 

 

 

specify read, write, verify, etc.

X:4

Parameter1

Depends on command

Depends on command

Y:x+1

Parameter2

Depends on command

Depends on command

 

Total Words

256

 

Table 47 Key Sector Format

The action codes are defined in Table below.

Action Code

Block Data

TF Data

Description

 

 

 

 

0000h

-

-

Reserved

 

 

 

 

0001h

Read/Write

Y

Long Sector Access (Not Supported)

 

 

 

 

0002h

Write

N

SCT Write Same

 

 

 

 

0003h

-

Y

Error Recovery Control

 

 

 

 

0004h

-

Y

Features Control

 

 

 

 

0005h

Read

N

SCT Data Table

 

 

 

 

0006h-BFFFh

-

-

Reserved

 

 

 

 

C000h-FFFFh

-

-

Vendor Specific

 

 

 

 

Table 48 SCT Action Code List

Hitachi hard disk drive specifications

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Hitachi HDS721032CLA362, HCS721050CLA382 Key Sector Format, Action codes are defined in Table below, SCT Action Code List

HCS721016CLA382, HCS721050CLA382, HCS721025CLA382, HDP725050GLA360, HUA722050CLA330/1 specifications

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