Table 60 Sct Write Same (Inputs); Table 61 Output Registers Of Sct Write Same (Success); Sct Command Set - Western Digital Ultrastar DC HC310 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 60 SCT Write Same (Inputs)

Outputs: (TF Data)
Command Block Input Registers (Success)
Error
Sector Count
Sector Number
Cylinder Low Number of sectors to transfer (LSB) = 01h
Cylinder High Number of sectors to transfer (MSB) = 00h
Device/Head
Status

Table 61 Output Registers of SCT Write Same (Success)

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.
Once the key sector has been issued, if the Function Code was 0002h or 0102h and the TF Data indicates that the
drive is ready to receive data, log page E1h should be written to transfer the data.
This command can change the Segment Initialized Flag. If the command writes all the user addressable sectors and
completes without encountering an error or being aborted, then the "Segment Initialized Flag" (bit 0 of the Status
Flags in the SCT Status. See Table 58) shall be set to 1. A write to any user addressable sector on the drive (except
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
Reserved
50h
Western Digital Hard Disk Drive OEM Specification
85