User manual

- Hitachi hard disk drive specifications –
22
4.5.4 Operating modes
4.5.4.1 Operating mode descriptions
Operating mode Description
Spin-up Start up time period from spindle stop or power down
Seek Seek operation mode
Write Write operation mode
Read Read operation mode
Unload Idle Spindle rotation at 7200 RPM with heads unloaded
Idle Spindle motor and servo system are working normally. Commands can be received
and processed immediately
Standby Actuator is unloaded and spindle motor is stopped. Commands can be received
immediately
Sleep Actuator is unloaded and spindle motor is stopped. Only soft reset or COMRESET can
change the mode to standby
Note: Upon power down or spindle stop a head locking mechanism will secure the heads in the OD parking position.
4.5.4.2 Mode transition times
Mode transition times are shown below.
From
To
RPM
Typical Transition
time(sec)
Max Transition
time(sec)
Standby
Idle
0 -> 7200
8 (1Disk model)
10 (2Disk model))
20
Idle
Standby
7200 -> 0
Immediately
20
Standby
Sleep
0
Immediately
Immediately
Sleep
Standby
0
Immediately
Immediately
Unload idle
Idle
7,200
0.7
1
Idle
Unload Idle
7,200
0.7
1
Low RPM Idle
Idle
4500 -> 7200
3 (1 Disk model)
4 (2 Disk model)
10
Note: The command is processed immediately but there will be an actual spin down time reflecting the seconds
passed until the spindle motor stops.
Note: Low rpm idle mode is supported on specific drive PN, only.
Table 13 Mode transition times