Operating Modes; Figure 14. Operating Mode; Figure 15. Drive Ready Time - Hitachi IC25N040ATCS04-0 - Travelstar 40GN 40GB UDMA/100 4200RPM 2MB 2.5" IDE Hard Drive Specifications

4.4.3 Operating modes

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

Figure 14. Operating mode

4.4.3.1 Mode transition time
Model
60-GB model
40-GB, 30-GB models
20-GB, 10-GB models

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.
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.
From
Standby
Standby
Standby
Hitachi Travelstar 60GH & 40GN hard disk drive specifications
To Transition
Time (typ)
Idle
Idle
Idle
17
Transition
Time (max.)
4.5 9.5
2.0 9.5
1.8 9.5