Quantum 10K II - Manual (Page 276)

SCSI Description
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives 5–209
5.43 SYNCHRONIZE CACHE Command (35h)
The SYNCHRONIZE CACHE command ensures that all logical blocks, within the
specified range in the drive's cache memory, have their most recent data value
recorded on the physical medium. If more recent data for a logical block, within the
specified range, exists in the cache memory than on the physical medium, then the
logical blocks from the cache memory is written to the physical medium. Logical
blocks are not necessarily removed from the cache as a result of the Synchronize
Cache operation.
Bit
Byte
7 6 5 4 3 2 1 0
0 Operation Code (35h)
1 Reserved Immed
= 0
RelAdr
2 - 5 Logical Block Address
6 Reserved
7 - 8 Number of Blocks
9 Control
Figure 5–103 SYNCHRONIZE CACHE Command Descriptor Block — Data Format
Table 5–98 SYNCHRONIZE CACHE Command — Field Descriptions
Field Description
Immed Immediate. Must be 0. The drive returns status after the synchronize cache
operation has been completed.
RelAdr Relative Address. Must be 0. Relative addressing is not supported.
Logical Block Address The address of the first logical sector of the range to be operated upon by
this command.
Number of Blocks Specifies the total number of contiguous logical blocks within the range.
When set to 0, the drive removes all sectors from the given Logical Block
Address on.
When Number of Blocks and Logical Block Address are both 0, the drive
removes all unwritten cache sectors to the medium.
It is not considered an error when no sectors within the specified range are
in the cache memory.