Sct Command Set; Table 50 Sct Write Same (Inputs); Table 51 Sct Write Same (Outputs) - Hitachi HDS723020BLA642 Specifications

9.18.3

SCT Command Set

9.18.3.1
SCT Write Same (action code : 0002h)
Inputs: (Key Sector)
Word Name
0 Action Code
1 Function Code
5:2 Start LBA
9:6 Count
11:10 Pattern
255:12 reserved

Table 50 SCT Write Same (Inputs)

Outputs: (TF Data)
Command Block Input Registers (Success)
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status

Table 51 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.
Value Description
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".
0001h Repeat Write Pattern (Background Operation)
0002h Repeat Write Sector (Background Operation)
0101h Repeat Write Pattern (Blocking Operation)
0102h Repeat Write Sector (Blocking Operation)
QWord First LBA
QWord Number of sectors to fill
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
0000h
00h
Reserved
Reserved
Number of sectors to transfer (LSB) = 01h
Number of sectors to transfer (MSB) = 00h
Reserved
50h
Hitachi hard disk drive specifications
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