Table 13.Description Of Operating Modes; Table 14.Mode Transition Time - Hitachi T7K250 - Deskstar - Hard Drive Specifications

E = Buffer-host transfer rate (byte/s)
4.5.6 Operating modes
4.5.6.1 Description of operating modes
Table 13: Description of operating modes
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 posi-
tion.
4.5.6.2 Mode transition time
Table 14: Mode transition time
From
Standby Idle
Idle Standby
Standby Sleep
Sleep Standby
Unload idle Idle
Idle Unload idle
Low RPM Idle Idle
"Immediately" means within 1ms.
Note: The command is processed immediately but there will be an actual spin down time reflecting the seconds
passed until the spindle motor stops.
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 pro-
cessed immediately.
Actuator is unloaded and spindle motor is stopped. Commands can be received immediately.
TActuator is unloaded and spindle motor is stopped. Only soft reset or hard reset can change
the mode to standby.
To RPM
0 ---> 7200 (3disks)
7200 ---> 0
0
0
7200
7200
4500->7200
Deskstar T7K250 Hard Disk Drive Specification
Transition time (sec)
Typical
9
Immediately
Immediately
Immediately
0.7
0.7
4
20
Maximum
20
Immediately
Immediately
Immediately
1
1
10