Start/Stop Unit Command (1B H ) - Seagate MEDALIST 1080SL Product Manual

50 Medalist 1080sl SCSI Product Manual, August 1995
The Mode Sense data length specifies the number of
Byte 0
bytes minus 1 of the Mode Sense data to be transferred
to the initiator.
Byte 1 The medium type is always 0.
Byte 2 The WP (write protect) bit is always 0, which means the
media is write-enabled.
The block descriptor length is the number of bytes in the
Byte 3
block descriptor. This value does not include the page
headers and mode pages that follow the block descriptor,
if any.
Byte 4 The density code is not supported.
Bytes 5–7 The number of blocks field contains the total number of
blocks available to the user, which is specified on page 1.
Byte 8 Reserved
Bytes 9–11 The block length specifies the number of bytes contained
in each logical block described by the block descriptor.
3.4.14 Start/Stop Unit command (1B
When the drive receives the Start/Stop Unit command, the drive either
spins up or spins down, depending on the setting of the start bit in byte 4.
If the host adapter supports disconnection, the drive disconnects when
it receives the Start/Stop Unit command and reconnects when it is up to
speed and ready.
Bytes
7 6
0 0 0
1 LUN = 0
2 0 0
3 0 0
4 0 0
5 0 0
Byte 1 If the immediate (Immed) bit is 0, the drive returns the status after
the command is completed. If the Immed bit is 1, the drive returns
the status when it receives the command.
Byte 4 If the start bit is 1, the drive spins up. If the start bit is 0, the drive
spins down.
)
H
Bits
5 4 3 2
0 1 1 0
0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
1 0
1 1
0 Immed
0 0
0 0
0 Start
0 0