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ST3655 Family AT Drives Product Manual, Rev. A
1.11 DC power
Except during the write procedure, you can turn off and turn on power to
the drive in any sequence without losing data or damaging the drive. If
you turn off the power during the write procedure, you may lose the data
currently being written.
1.11.1 Input noise
Voltage tolerance
(including noise)
Input noise frequency
(max)
Input noise
(max, peak-to-peak)
1.11.2 Power management
This drive uses power-management modes to reduce its overall power
consumption. The level of drive activity for each power-management
mode is described below.
You can customize the power-management modes using the AT inter-
face commands that control the power modes. These commands are
described in the Seagate ATA Interface Reference Manual , publication
number 36111- xxx .
Note. If you install one of these power-management drives as a slave to
a master drive that does not support power management (for
example, a Seagate ST1239A drive), do not use power-manage-
ment commands on either drive.
1.11.3 Idle and standby timers
The drive can enter the Idle or Standby modes by either of two methods:
• The computer can send either the Idle Immediate command or the
Standby Immediate command.
• The idle timer or the standby timer can count down to zero.
At power-on, the drive sets the idle timer to enter the Idle mode after
5 seconds of inactivity; the standby timer is disabled. You can set the
timer delays using the system setup utility. During each read, write or
+5V
+12V
± 5%
± 5%
25 MHz
25 MHz
100 mV
240 mV
7
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