HP Q153090901 - Manual (Page 178)

Commands 178
WRITE 0Ah
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 MODE SELECT Parameter is set to either 1 or
2 so that Immediate reporting is enabled; upon a write command the drive will report GOOD
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:
• 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:
Command descriptor block:
CDB fields:
ERASE LOAD LOCATE LOG SELECT MODE SELECT READ
REWIND SEND DIAGNOSTIC SPACE VERIFY WRITE BUFFER
Illegal Field Fixed Bit Reservation Deferred Error
Unit Attention Media Access Media Write Diagnostic Status
7 6 5 4 3 2 1 0
0 Operation Code (0Ah)
1 Reserved (0) Fixed
2 (MSB)
Transfer Length 3
4
(LSB)
5 Control
Fixed 0 The Transfer Length field specifies the length of the transfer in bytes.
1 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.
Transfer
Length
0 No data is transferred. The current logical position will be unchanged.
>0 The amount of data to be transferred, in bytes or blocks as determined by the Fixed field.