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ters. A Block Descriptor Length of zero indicates that no block descriptors shall be included in the param-
eter list. This condition shall not be considered an error.
[3]
a. For drives that do not support capacity programming, the Density Code shall be 00h to define the
default density of medium.
b. If the drive supports capacity programming (see note [4]), byte 0 is useable as MSB part of the number
in bytes 1, 2, and 3. For drives whose capacity does not require the use of byte 0, byte 0 will always be
00h.
[4]
a. For drives that do not support capacity programming, these bytes are always zero.
b. A value of zero in bytes 1, 2, and 3 indicates that the drive shall not change the capacity it is currently
formatted to have. Any other value in these bytes is ignored by drives not having the capacity program-
ming feature. For drives that have the capacity programming capability (see individual drive's Product
Manual, Volume 1), a number in bytes 0, 1, 2, and 3 that is less than the maximum number of LBAs
changes the drive capacity to the value in the block descriptor bytes 0, 1, 2, and 3. A value greater than
the maximum number of LBAs is rounded down to the maximum capacity.
[5]
Block Length specifies the length in number of bytes for each logical block described by the Block
Descriptor. Set to desired sector size before a Format. (Valid values are even numbered sizes from 180 to
4096. Not all drives can format down to 180; some have a minimum of 256).
[6]
See Mode Sense (10) command (Section 5.13) for detailed descriptions of the Mode Select/Sense pages.
SCSI Interface Product Manual, Rev. J
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