9.18.3SCT Command Set

9.18.3.1SCT Write Same (action code : 0002h)

Inputs: (Key Sector)

Word

Name

Value

Description

0

Action Code

0002h

This action writes a pattern or sector of data repeatedly to

 

 

 

the media. This capability could also be referred to as “Write

 

 

 

All” or “Write Same”.

1

Function Code

0001h

Repeat Write Pattern (Background Operation)

 

 

0002h

Repeat Write Sector (Background Operation)

 

 

0101h

Repeat Write Pattern (Blocking Operation)

 

 

0102h

Repeat Write Sector (Blocking Operation)

5:2

Start LBA

QWord

First LBA

9:6

Count

QWord

Number of sectors to fill

11:10

Pattern

DWord

If the Function Code is 0001h, this field contains a 32-bit

 

 

 

pattern that is written on the media starting at the location

 

 

 

specified in words two through five

255:12

reserved

0000h

 

Table 55 SCT Write Same (Inputs)

Outputs: (TF Data)

Command Block Input Registers (Success)

Error

00h

 

 

Sector Count

Reserved

 

 

Sector Number

Reserved

 

 

Cylinder Low

Number of sectors to transfer (LSB) = 01h

 

 

Cylinder High

Number of sectors to transfer (MSB) = 00h

 

 

Device/Head

reserved

 

 

Status

50h

 

 

Table 56 SCT Write Same (Outputs)

The SCT Write Same command will begin writing sectors from Start LBA in incrementing order until Count sectors have been written. A Count of zero means apply operation from Start LBA until the last user LBA on the drive is reached. The HPA feature determines the last user LBA. This command will not write over a hidden partition when hidden partitions are enabled using the Host Protected Area drive capabilities. Automatic sector reassignment is permitted during the operation of this function.

If Start LBA or Start LBA + Count go beyond the last user LBA then an error is reported and the SCT command is not executed. Issuing this command with a value of zero for Start LBA and Count will cause all LBAs of the drive to be written the specified pattern.

Hitachi hard disk drive specifications

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Hitachi 7K1000C, A7K2000 SCT Command Set, SCT Write Same action code 0002h, SCT Write Same Inputs, SCT Write Same Outputs
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HCS721016CLA382, HCS721050CLA382, HCS721025CLA382, HDP725050GLA360, HUA722050CLA330/1 specifications

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