Hitachi 100GB 7200 RPM HTE721010G9SA00 Benutzerhandbuch

Travelstar E7K100 (Serial ATA) Hard Disk Drive Specification

51 

The Check Power Mode command allows a host to determine if a device is currently in, going to, or leaving 
standby mode.

The Idle and Idle Immediate commands move a device to idle mode immediately from the active or standby 
modes. The idle command also sets the standby timer count and starts the standby timer.

The sleep command moves a device to sleep mode. The device's interface becomes inactive at the completion of 
the sleep command. A reset is required to move a device out of sleep mode. When a device exits sleep mode it will 
enter standby mode.

The Standby and Standby Immediate commands move a device to standby mode immediately from the active or 
idle modes. The standby command also sets the standby timer count.

1. Confirm the completion of writing cached data in the buffer to media.

2. Unload the heads on the ramp.

3. Set the DRDY bit and the DSC bit in Status Register.

4. Set the INTRQ (completion of the command).

5. Activate the spindle break to stop the spindle motor.

6. Wait until the spindle motor is stopped.

7. Perform the post process.

The standby timer provides a method for the device to automatically enter standby mode from either active or idle 
mode following a host programmed period of inactivity. If the device is in the active or idle mode, the device waits 
for the specified time period and if no command is received, the device automatically enters the standby mode.

In the active, idle, and standby modes, the device shall have the RDY bit of the status register set. If the BSY bit is 
not set, the device shall be ready to accept any command.

In sleep mode, the device's interface is not active. A host shall not attempt to read the status of the device or issue 
commands to the device.

The lowest power consumption when the device is powered on occurs in Sleep Mode. When 
in Sleep Mode, the device requires a reset to be activated. 

The device interface is capable of accepting commands, but since the media may not be 
immediately accessible, there is a delay while waiting for the spindle to reach operating 
speed.

The device interface is capable of accepting commands and the command can be executed 
immediately.

The device is in execution of a command or accessing the disk media with the read look-
ahead function or the write cache function.