Operating Modes; Table 9 Mode Transition Times - Hitachi HDS723020BLA642 Specifications

4.5.4

Operating modes

4.5.4.1
Operating mode descriptions
Operating mode
Spin-up
Seek
Write
Read
Unload Idle
Idle
Standby
Sleep
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
Standby Idle
Idle Standby
Standby Sleep
Sleep Standby
Unload idle Idle
Idle Unload Idle
Low RPM Idle Idle
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 9 Mode transition times

Description
Start up time period from spindle stop or power down
Seek operation mode
Write operation mode
Read operation mode
Spindle rotation at 7200 RPM with heads unloaded
Spindle motor and servo system are working normally. Commands can be received
and processed immediately
Actuator is unloaded and spindle motor is stopped. Commands can be received
immediately
Actuator is unloaded and spindle motor is stopped. Only soft reset or hard reset can
change the mode to standby
To RPM
0 -> 7200
7200 -> 0
7,200
7,200
4500 -> 7200
Typical Transition
time(sec)
Immediately
0 Immediately
0 Immediately
Immediately
23
Max Transition
time(sec)
14 20
Immediately
Immediately
Immediately
0.8
Immediately
6 10
1