Fujitsu MHV2040BH, MHV2120BH, MHV2100BH, MHV2080BH manual Unload Feature Unload Immediate Command

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					X’55’
CL					X’4E’
SN					X’4C’
SC					xx
FR					X’44’

At command completion (Shadow Block Registers contents to be read)

ST				Status information
DH	x	x	x		x	xx
CH					xx
CL					xx
SN					X’C4’
SC					xx
ER				Error information

C141-E224 5-49