IBM IC25N040ATCS04 - Travelstar 40 GB Hard Drive, Specifications

Page: 30 / 217

4.4.3 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 14. Operating mode
4.4.3.1 Mode transition time
9.5 1.8 Idle Standby 20-GB, 10-GB models
9.5 2.0 Idle Standby 40-GB, 30-GB models
9.5 4.5 Idle Standby 60-GB model
Transition
Time (max.)
Transition
Time (typ) To From Model
Figure 15. Drive ready time
4.4.3.2 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 58,
"Drive address setting" for details.
4.4.3.3 Adaptive power save control
The transient timing from Performance Idle mode to Active Idle mode and Active Idle mode to Low Power
Idle mode is controlled adaptively according to the access pattern of the host system. The transient
timing from Low Power Idle mode to Standby mode is also controlled adaptively, if it is allowed by Set
Features Enable Advanced Power Management subcommand.
Travelstar 60GH & 40GN hard disk drive specifications
17