Sony SDX-800V/R manual Write 0Ah, Obsolete Reserve Fixed

WRITE 6.Command Specification

6.29.WRITE 0Ah

Bit	7	6	5	4		3	2	1	0
Byte
0				Operation		Code (0Ah)
1		Obsolete				Reserve			Fixed
2	(MSB)			Transfer Length
3
4									(LSB)
5					Control

WRITE transfers one or more blocks from the Host to the tape beginning at the current logical 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 initiator. A single block is transferred from the initiator 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 initiator.

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.

Note: If the host issue a write command with the odd block size and Wide SCSI, the CHECK CONDITION STATUS will be reached and the sense key will be set to ILLEGAL REQUEST.

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 will be transferred and the current position on the logical unit will not be changed.

The drive flushes its write buffer to tape and appends an EOD marker under the following conditions:

1.Receipt of the following non-write commands:

READ

SPACE

ERASE

READ BUFFER

WRITE BUFFER REWIND LOAD/UNLOAD MODE SELECT LOCATE

The buffer can be maintained through the following media commands, assuming that no other flush condition has been met, for example, write hold-off time-out.

WRITE

WRITE FILE MARKS with Immediate bit set

2.The write hold-off time limit is exceeded.

SONY AIT-3Ex drive SDX-800V series Ver.1.1 6-105