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SCSI Description
Maxtor Atlas 10K III 5-107
The READ (10) command requests that data be transferred from the drive to the
initiator. The amount of data transferred is specified by the transfer length field. The
starting point is specified by the logical sector address. The data format and field
descriptions are shown in Table 5-127 and Table 5-128 respectively.
READ (10) Command-Data Format
READ (10) Command-Field Descriptions
0 Operation Code (28h)
1 Reserved DPO FUA Reserved RelAdr
2 - 5 Logical Block Address
6 Reserved
7 - 8 Transfer Length
9 Control
DPO
Disable Page Out. When the value is 0, the drive caches the data read,
using its normal Logical Read Unit policies.
When the value is 1, the drive assigns to logical blocks accessed by the
READ (10) command the lowest priority for being fetched into or retained
by the cache.
FUA
Force Unit Access. When the value is 0, the drive is allowed to satisfy the
read with cache-resident data.
A value of 1 indicates that the drive accesses the media in performing the
command before returning GOOD status.
RelAdr
Relative Addressing. The drive does not support relative addressing. Must
be 0
Logical Block Address Specifies the logical sector address where the read operation will begin.
Transfer Length
Specifies the number of contiguous logical blocks of data to transfer. A
transfer length of 0 indicates that no logical blocks are to be transferred.
Any other value indicates the number of logical blocks to be transferred.
The drive returns a CHECK CONDITION status with the correct sense data
if the specified transfer extends beyond the logical sector space.