Seagate STT8000A - Manual (Page 70)

Chapter 5 ATAPI Interface
Page 62 STT8000A Product Manual
Write Buffer (download microcode) command
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation code (3Bh)
1 Reserved 101 (Mode)
2 Reserved
3 Reserved
4 Reserved
5 Reserved
6 (MSB)
7 Transfer Length
8 (LSB)
9 Reserved
The Write Buffer command is intended only to provide a method for downloading
new drive microcode (firmware) into Flash EPROM, so the only valid MODE is 101
(download microcode and save). The drive must be Not Ready (unloaded) for this
command to be accepted, and the transfer length is set to the download file size,
which is currently 0x026800. All data is transferred in one command.