Write Long (3F) - IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive Specifications

7.39 WRITE LONG (3F)

Byte
7 6
0
1 LUN
2 (MSB)
3
4
5
6
7 (MSB)
8
9 VU = 0
Figure 122. WRITE L O N G (3F)
The WRITE LONG command requests the file to write one block of data transferred from the initiator.
The transfer data must include;
512 bytes of data
34 bytes of ECC data
Parameters are;
Logical Block Address field specifies the logical block at which the write operation shall occur.
Byte Transfer Length. This field must exactly specify the number of bytes of data that are available for
transfer. If a non-zero byte transfer length does not match the available data length, the target terminates
the command with CHECK CONDITION status, the sense key is set to ILLEGAL REQUEST and
an additional sense code set to INVALID FIELD IN CDB. The valid and ILI bits is set to one and the
information field is set to the difference of the requested length minus the actual length in bytes. Nega-
tive values are indicated by two's complement notation.
RelAdr (Relative Block Address) is not supported. Must be set to ZERO.
Bit
5 4 3
Command Code = 3Fh
Reserved = 0
Logical Block Address
Reserved = 0
Byte Transfer Length
Reserved = 0
2 1 0
RelAdr
= 0
(LSB)
(LSB)
FLAG LINK
SCSI C O M M A N D SET
159