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5.3 Host Commands
• Unload Feature (Unload Immediate Command):
When the device received the IDLE IMMEDIATE command with the UNLOAD
FEATURE, the head(s) is unloaded to the ramp position. After the device
completed the unload operation, the INTRQ signal will be asserted and the BUSY
flag will be cleared. The time until the head(s) unload to the ramp position is
typically less than 500 milliseconds. This unload operation is not same as the
power management operation. The device just unloads the head(s), and not
executes the power consumption restraint operation. This unload operation effects
the normal (not emergency) load/unload guarantee count per the device life.
Even if the device executes reading look-ahead operation or executes writing
operation, the device unloads the head(s) to the ramp position as soon as possible
when received the IDLE IMMEDIATE command with the Unload Feature. When
the writing operation is stopped, the device keeps the unwritten data. And, the
device keeps the unloaded state until receiving a Soft Reset/ COMRESET, or a
new command except IDLE IMMEDIATE command with the Unload Feature.
At command issuance (Shadow Block Registers setting contents)
CM X’E1’
DH x x x x xx
CH
CL
SN
SC
FR
X’55’
X’4E’
X’4C’
xx
X’44’
At command completion (Shadow Block Registers contents to be read)
ST Status information
DH x x x x xx
CH
CL
SN
SC
ER
xx
xx
X’C4’
xx
Error information
C141-E249 5-49