User Manual

SCSI Commands Reference Manual, Rev. J 412
www.seagate.com Parameters for direct access devices
SSEC bit set and HSEC bits
A HSEC bit set to one indicates that the target shall use hard sector formatting. The HSEC bit and the SSEC bit are mutually exclusive in MODE
SELECT commands.
Possible combinations of MODE SENSE Report Default Values:
SSEC HSEC
0 0 Target shall not return this combination
1 0 Target supports Soft sector formatting only
0 1 Target supports Hard sector formatting only
1 1 Target supports both Soft and Hard sector formatting
Possible combinations of MODE SENSE Report Changeable Values
SSEC HSEC
0 0 Sector formatting Not changeable
1 0 Target shall not return this combination
0 1 Target shall not return this combination
1 1 Target supports both Soft and Hard sector formatting
RMB (Removable Medium) bit
0 A removable medium (RMB) bit set to zero indicates that the medium is not removable.
1 A RMB bit set to one indicates that the medium is removable.
SURF (Surface) bit
The SURF (Surface) bit indicates how the target shall map the logical block addressing into physical block addressing.
0 A SURF bit set to zero indicates that the target shall allocate progressive addresses to all sectors within a cylinder prior to allocating sec-
tor addresses to the next cylinder.
1 A SURF bit set to one indicates that the target shall allocate progressive addresses to all sectors on a surface prior to allocating sector
addresses to the next surface.
DRIVE TYPE field
The DRIVE TYPE field bits are defined as follows:
a) The Hard Sectoring (HSEC) bit (bit 6) set to one indicates the drive shall use hard sector formatting.
b) Bits 0-5, and 7 are not implemented by the drive and are always zero. All bits (0-7) are not changeable.
c) See individual drive’s Product Manual, Volume 1, MODE SENSE Data clause for changeable values.