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152
A Number of Blocks of zero indicates that all of the remaining logical blocks of the logical unit have the
medium characteristics specified by the Block Descriptor.
b. For drives that have capacity programming capability, these bytes do not report back the drive capacity
on some models. These bytes are always zero on those models. Some models do report drive capac-
ity in bytes 0, 1, 2, and 3, so those bytes will be nonzero. See individual drive's Product Manual, Vol-
ume 1, for the drive of interest.
[7]
The Block Length, as defined after a format function, specifies the length in bytes of each logical block
described by the Block Descriptor. Default is 512 if no Mode Select command is received before the for-
mat command. The usual valid values are 256 through 4096. Some drive products can format down to
180 bytes per sector. Some products can only format an even numbered value of bytes per sector (180 -
4096).
[8]
When used with the Mode Sense command, a DPO-FUA bit of zero indicates that the target does not con-
tain a cache memory or does not support the DPO and FUA bits. A DPO-FUA bit of one indicates that the
target supports the DPO and FUA bits.
5.14
Move Medium command (A7h)
Not implemented. If received, a Check Condition status is sent.
SCSI Interface Product Manual, Rev. J
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