IBM DJSA-210 Hard Drive Specifications - Page 30

Operating modes, 5.3.1 Mode transition time, 5.3.2 Operating mode at power - connector

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4.5.3 Operating modes Operating mode Spin-Up: Seek: Write: Read: Performance: Active idle: Low power idle: Standby: Sleep: Description Start up time period from spindle stop or power down. Seek operation mode Write operation mode Read operation mode The device is capable of responding immediately to idle media access requests. All electronic components remain powered and the full frequency servo remains operational. The device is capable of responding immediately to media access requests. Some circuitry-including servo system and R/W electronics-is in power saving mode. The head is parked near the mid-diameter the disk without servoing. A device in Active idle mode may take longer to complete the execution of a command because it must activate that circuitry. The head is unloaded onto the ramp position. The spindle motor is rotating at full speed. The device interface is capable of accepting commands. The spindle motor is stopped. All circuitry but the host interface is in power saving mode. The execution of commands is delayed until the spindle becomes ready. The device requires a soft reset or a hard reset to be activated. All electronics, including spindle motor and host interface, are shut off. Figure 12. Operating mode 4.5.3.1 Mode transition time Model DJSA-232 DJSA-230/220 DJSA-210/205 From Standby Standby Standby To Transition Transition Time (typ) Time (max.) Idle 4.5 9.5 Idle 2.0 9.5 Idle 1.8 9.5 Figure 13. Drive ready time 4.5.3.2 Operating mode at power on The device goes into Idle mode after power on or hard reset as an initial state. Initial state may be changed to Standby mode using pin C on the interface connector. Refer to section 7.10 on page 57, "Drive address setting", for details. Travelstar 33GH/30GT/20GN hard disk drive specifications 16

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4.5.3 Operating modes
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
Performance:
The device is capable of responding immediately to idle media access requests.
All electronic components remain powered and the full frequency servo remains
operational.
Active idle:
The device is capable of responding immediately to media access requests.
Some circuitry—including servo system and R/W electronics—is in power saving
mode. The head is parked near the mid-diameter the disk without servoing.
A device in Active idle mode may take longer to complete the execution of a
command because it must activate that circuitry.
Low power idle:
The head is unloaded onto the ramp position.
The spindle motor is rotating at full speed.
Standby:
The device interface is capable of accepting commands.
The spindle motor is stopped. All circuitry but the host interface is in power saving
mode.
The execution of commands is delayed until the spindle becomes ready.
Sleep:
The device requires a soft reset or a hard reset to be activated.
All electronics, including spindle motor and host interface, are shut off.
Figure 12. Operating mode
4.5.3.1 Mode transition time
9.5
1.8
Idle
Standby
DJSA-210/205
9.5
2.0
Idle
Standby
DJSA-230/220
9.5
4.5
Idle
Standby
DJSA-232
Transition
Time (max.)
Transition
Time (typ)
To
From
Model
Figure 13. Drive ready time
4.5.3.2 Operating mode at power on
The device goes into Idle mode after power on or hard reset as an initial state. Initial state may be
changed to Standby mode using pin C on the interface connector. Refer to section 7.10 on page 57,
"Drive address setting", for details.
Travelstar 33GH/30GT/20GN hard disk drive specifications
16