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WRITE Command (0Ah) SDLT 600 SCSI Interface Guide

4-244 January 2005 81-81200-02 REV A01

Exception Conditions

If the drive detects End of Tape (EOT) while writing, it finishes writing any buffered data. The

command terminates with CHECK CONDITION status. Within the Sense Data, the EOM field is set,

the Sense Key is set to NO SENSE, and the Additional Sense Code and Additional Sense Code

Qualifier fields are set to EOM / P DETECTED. The drive attempts to complete any subsequent

writes, returning a CHECK CONDITION status in each case.

If the drive encounters the physical EOM when attempting a WRITE, it returns a CHECK

CONDITION status. Within the Sense Data, the EOM and Valid fields 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 drive

physically positions the tape at EOM / P.

Table 4-143. WRITE Command Data — Field Descriptions

Field Name Description

Fixed Sets both the meaning of the Transfer Length field and whether fixed-length

or variable-length blocks are to be transferred.

When set to 0, variable-length block mode is selected. A single block is

transferred from the initiator and is written to the drive beginning at the

current logical tape position. Upon successful termination, the drive logically

positions the tape after this block on the EOM / EOP side. The Transfer

Length specifies the number of bytes that the drive handshakes from the

initiator as one block.

When set to 1, the Transfer Length field specifies the number of blocks to be

transferred to the drive beginning at the current tape position. This form of

WRITE is valid only if the drive is currently operating in fixed-block mode,

as indicated by the Block Size field in the Mode Parameter Block Descriptor

(see “Mode Parameter List” on page 4-69). The current block length is the

block length defined in the MODE SELECT command. Upon termination,

the drive logically positions the tape after these blocks.

Transfer

Length

Contains the length of the data transfer in bytes or blocks depending on

whether fixed- or variable-block mode is selected.

When set to 0, no data is transferred and the current position on the drive is

not changed.

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Quantum 1200 Series DAT Autochanger Guide de l'utilisateur Page 286