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Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
301
19.60 WRITE LONG (3F)
Table 248: WRITE LONG (3F)
The WRITE LONG command requests the drive to write one block of data transferred from the Initiator.
The transfer data must include
•User Data
• 56 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 specify the exact number of bytes of data available for transfer. If a non-zero
byte transfer length does not match the available data length, the Target terminates the command with Check Condi-
tion status, then the sense key is set to Illegal Request, and an additional sense code is set to Invalid Field in CDB.
The valid and ILI bits are set to one and the information field is set to the difference of the requested length minus the
actual length in bytes. Negative values are indicated by two's complement notation.
Byte
Bit
7654321 0
0 Command Code = 3Fh
1 Reserved = 0 Reserved = 0
Obso-
lete
2-5
(MSB)
Logical Block Address
(LSB)
6 Reserved = 0
7-8
(MSB) Byte Transfer Length
(LSB)
9 VU = 0 Reserved = 0 FLAG LINK