Table 11. Drive Ready Time; Operating Modes; Mode Transition Time - Hitachi HTS541616J9SA00 Specifications

Operating modes

4.4.3
Operating mode Description
Start up time period from spindle stop or power down.
Spin-Up
Seek operation mode
Seek
Write operation mode
Write
Read operation mode
Read
The device is capable of responding immediately to idle media access requests. All
Performance
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.
Active idle 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
Low power idle
speed.
The device interface is capable of accepting commands. The spindle motor is
Standby 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,
Sleep
including spindle motor and host interface, are shut off.
Table 10. Operating mode
4.4.3.1

Mode transition time

From To
Standby Idle

Table 11. 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.
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 5K160 (SATA) Hard Disk Drive Specification
Transition
Time (typ)
2.5
Transition Time
(max.)
9.5
21/167
The transient