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Medalist Family AT Product Manual, Rev. A
1.11.3 Idle and Standby modes
The drive may enter Idle mode or Standby mode through either of the
following actions:
• The computer can send one of the Idle commands or the Standby
commands. All of the commands that put the drive into the Idle or
Standby mode are listed in the Seagate ATA Interface Reference
Manual.
• The idle timer or the standby timer counts down to zero.
At power-on, the drive sets the idle timer to enter the Idle mode after
25 seconds of inactivity and the standby timer is disabled. On some
computers, the system setup utility provides a means of setting the timer
delay values. During each read, write or seek, the drive reinitializes the
idle timer and begins counting down from the specified delay to zero.
If the idle timer reaches zero before the drive is commanded to read,
write or seek, the drive switches to the Idle mode. Then, if the standby
timer is enabled, the standby timer begins counting down. After the
standby timer has finished counting down, the drive switches to Standby
mode. To set the idle and standby timers, refer to the Idle command in
the Seagate ATA Interface Reference Manual , publication number
36111- xxx .
In both the Idle and Standby modes, the drive accepts all commands and
returns to the Seeking or Read/write modes any time disc access is
necessary.
1.11.4 Power-management modes
The following power-management modes are supported by the drive:
• Spinup. The drive brings the spindle and discs up to operating speed.
Power in this mode is defined as the average power during the first
10 seconds after starting spinup. The drive enters this mode during
startup and from the Standby mode.
• Seeking. The drive moves the read/write heads to a specific location
on the disc surface in preparation for reading or writing the disc.
Read/write electronics are powered down and servo electronics are
active. The power measure during this mode is the average power
while executing random seeks with a 2-revolution (26.6 msec) dwell
between Seek commands.
• Read/write. The drive reads from or writes to the disc. Read/write
electronics are active and the servo is on track. The drive enters this
mode from the Idle mode.
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