Seagate ST3285N, Product Manual

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3.5.11 Write Long command (3F
H
)
When the drive receives the Write Long command, it writes one logical
block of data and six bytes of error correction code (ECC) to the disc.
During this command, the drive does not perform any ECC verification.
Bit
Byte
7 6 5 4 3 2 1 0
0 0 0 1 1 1 1 1 1
1 LUN 0 0 0 0 0
2–5 Logical block address
6 0 0 0 0 0 0 0 0
7–8 Byte transfer length
9 0 0 0 0 0 0 Flag Link
Bytes 2–5 The logical block address specifies the LBA where the drive
begins writing data.
Bytes 7–8 The byte transfer length specifies the number of bytes
transferred by the initiator to the drive. If the transfer length
does not equal the sum of the logical block size plus six, the
command is terminated with a check condition status. If the
byte transfer length is zero, the initiator does not transfer
any data to the drive; this condition is not considered an
error.
74 ST3655 Family SCSI Drives Product Manual, Rev. A