Operating Modes; Figure 17. Operating Modes; Figure 18. Drive Ready Time For All Models - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

4.5.3 Operating modes

Operating mode
Spin-Up
Seek
Write
Read
Performance
Active idle
Low power idle
Standby
Sleep

Figure 17. Operating modes

4.5.3.1 Mode transition time
From
Standby Idle

Figure 18. Drive ready time for all models

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, "Drive address
setting" on page 62 for details.
4.5.3.3 Adaptive power save control
The transient timing from Performance Idle mode to Low Power Idle is controlled adaptively according to
the access pattern of the host system in order to reduce the average power dissipation.
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.
To Transition Time
(typ)
(seconds)
1.8
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
Transition Time
(max.)
(seconds)
9.5
19