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WRITE
Zero or more blocks of data are transferred from the host to tape starting at the current logical
position.
It is recommended that the Buffered Mode field of the
2 so that Immediate reporting is enabled; upon a write command the drive will report
status once the data is successfully transferred to the data buffer (but not necessarily to tape).
Data held in the buffer is flushed to tape in the following circumstances:
A SCSI command is received that forces a flush:
•
ERASE
REWIND
•
Buffered mode is not enabled. If buffered mode has not been set to 1 or 2, the buffer is
flushed before the command completes.
•
The write delay time is exceeded. This is defined by the Write Delay field of the Device
Configuration Mode Select page. If the drive is idle for longer than this (no operations that
access the tape have been performed), any data in the buffer is flushed to tape.
Pre-execution checks:
Illegal Field
Unit Attention
Command descriptor block:
7
0
1
2
(MSB)
3
4
5
CDB fields:
Fixed
0
1
0
Transfer
Length
>0 The amount of data to be transferred, in bytes or blocks as determined by the Fixed field.
178
Commands
LOAD
SEND DIAGNOSTIC
Fixed Bit
Media Access
6
5
Operation Code (0Ah)
Reserved (0)
The Transfer Length field specifies the length of the transfer in bytes.
The Transfer Length field specifies the length of the transfer in blocks. The size of each
block (in bytes) is determined by the current Block Length given in the Mode Select
Parameter block descriptor.
No data is transferred. The current logical position will be unchanged.
MODE SELECT
LOCATE
LOG SELECT
SPACE
VERIFY
Reservation
Deferred Error
Media Write
Diagnostic Status
4
3
Transfer Length
Control
Parameter is set to either 1 or
MODE SELECT
WRITE BUFFER
2
1
0
Fixed
(LSB)
0Ah
GOOD
READ
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