Seagate Medalist 2520 Product Manual page 18

10
All measurements were taken at the drive power connector. A true RMS
meter was 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 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.
The drive does not enter this mode automatically.
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 10 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.
1.11.1.3 Sleep mode
The drive enters Sleep mode after receiving a Sleep command from the
host. The heads are parked and the spindle is at rest. The drive leaves
Sleep mode after it receives a Hard reset or Soft reset from the host.
After receiving a soft reset, the drive exits Sleep mode and enters
Standby mode. After a hard reset, the drive exits Sleep mode and enters
Active mode.
Medalist 2520 Product Manual, Rev. A