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WRITE
7.24. WRITE 0Ah
Bit
7
Byte
0
1
2
(MSB)
3
4
5
6
7
8
9
10
11
The WRITE command requests that the Device write the data that is transferred from the Host starting at the
current position.
Fixed: The Fixed Bit specifies both the meaning of the Transfer Length field and whether fixed-length or variable
length blocks are to be transferred.
If the Fixed bit is set to ZERO, Variable Block mode is selected. The Transfer Length specifies the maximum
number of bytes that the drive handshakes out from the host. A single block is transferred from the host and is
written beginning at the current logical tape position. Upon successful termination, the tape is logically positioned
after this block (EOM/P side). The Transfer Length specifies the maximum number of bytes that the drive
handshakes out from the host.
If the Fixed Bit is set to one, the Transfer Length field specifies the number of blocks to be transferred to the drive,
beginning at the current logical position. This is valid only if the drive is currently operating in Fixed Block mode, in
other words, when it has been instructed to use fixed-length blocks with MODE SELECT. The current block length
is the block length defined in the MODE SELECT command. Upon termination, the tape is logically positioned
after these blocks (EOM/P side).
If EOT is detected while writing, the drive will finish writing any buffered data. The command will terminate with
CHECK CONDITION status. Within the Sense data, the EOM bit is set, the Sense Key field is set to NO SENSE
and the Additional Sense Code and Additional Sense Code Qualifier fields are set to EOM/P detected. The drive
will attempt to complete any subsequent writes, returning a CHECK CONDITION status in each case.
If the drive encounters the physical EOM when attempting a WRITE, a CHECK CONDITION status is returned.
Within the Sense data, the EOM and Valid bits are set and the Sense Key field is set to VOLUME OVERFLOW.
The Information fields contain the residue count and the Additional Sense Code and Additional Sense Code
Qualifier fields are set to EOM/P Detected. The tape is physically positioned at EOM/P.
If the Transfer Length is zero, no data shall be transferred and the current position shall not be changed. This
condition shall not be considered an error. The DSC bit is reset (0) after this command is accepted and all data
has been transferred. This bit is set (1) when there are at least 52 empty blocks in the buffer available for the next
WRITE command.
The drive flushes its write buffer to tape and appends an EOD marker on receipt of the following non-write
commands:
READ, SPACE, VERIFY, READ BUFFER, WRITE BUFFER, REWIND, LOAD/UNLOAD, MODE
SELECT, LOG SENSE
SONY AIT-2 Turbo drive SDX-560V series Ver.1.0
6
5
4
Operation Code (0Ah)
Reserved
Transfer Length
7. ATAPI Packet Command Specification
3
2
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1
0
Fixed
(LSB)
7-69
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