Seagate Medalist Pro Series Product Manual page 18

10 Medalist Pro 6450/5040 Product Manual, February 1997
All measurements were taken at the drive power connector. A true RMS
meter is used to measure all modes except Standby. A DMM is used for
Standby measurements.
1.11.1.1 Active mode
During the Active mode, the drive is involved in spinup, seeking or
read/write activities. The table on page 11 shows the typical power-con-
sumption rates for these activities.
Spinup. The drive enters the Spinup mode from the Standby mode
and brings the spindle and discs up to operating speed. Power in this
mode is defined as the peak power after starting spinup.
Seek. The drive enters the Seek mode from the Idle mode. The
read/write heads are moved to a specific location on the disc surface
in preparation for reading from or writing to the disc. Read/write
electronics are powered down but servo electronics are active. Typical
power is defined as the power average of executing random seeks
with a 2-revolution (22.2 msec) dwell between Seek commands.
Read/write. Read/write mode is entered from Idle mode. Read/write
electronics are activated and the servo is on track. The drive reads
from or writes to the disc.
1.11.1.2 Idle mode
The Idle mode is entered 1 minute after the last disc I/O activity. The motor
is up to speed and the actuator is repositioned once every minute. This mode
uses an algorithm that minimizes head media interface stresses. The drive
can enter Idle mode from either Active or Standby mode.
1.11.1.3 Standby mode
The spindle is stopped, the heads are parked in the landing zone, the
actuator is latched and some of the drive electronics are powered down.
Note. When recovering from Standby or Sleep mode, you must allow
the drive to post ready before reporting a timeout. The drive can
take up to 20 seconds to post ready. In a master and slave
configuration, the master can wait up to 31 seconds for the slave
to complete diagnostics before posting ready.
1.11.1.4 Sleep mode
The sleep mode implementation is the same as Standby mode.