U Series CE Family Product Manual, Rev. A 11
established using a Standby or Idle command. In St andby mode, the
drive buffer is enabled, the heads are parked and th e spindle is at rest.
The drive accepts all commands and returns to Active mode any time
disc access is necessary.
•Sleep mode
The drive enters Sleep mode after receiving a Sleep command from
the host. In Sleep mode, the drive buffer is disabled, 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
reset, the drive exits Sleep mode and enters Standby mode with all
current translation parameters intact.
•Idle and Standby timers
Each time the drive performs an Active function (read, wr ite or seek),
the standby timer is reinitialized and begins counting down from its
specified delay times to zero. If the standby timer reaches zero bef ore
any drive activity is required, the drive makes a transition to Stan dby
mode. In both Idle and Standby mode, the drive accepts all commands
and returns to Active mode when disc access is necessa ry.
1.8 Environmental tolerances1.8.1 Ambient temperature
Ambient temperature is defined as the temperature of t he environment
immediately surrounding the drive. Actual drive case temperatu re should
not exceed 65°C (149°F) within the operating ambient conditions. Rec-
ommended measurement locations are shown in Figure 3 on page 20.
Above 1,000 feet (305 meters), the maximum temperature is der ated
linearly to 112°F (44°C) at 10,000 feet (3,048 meters).
1.8.2 Temperature gradient
Operating 0° to 60°C (32° to 131°F)
Nonoperating –40° to 70°C (–40° to 158°F)
Operating/Nonoperating 20°C per hour (36°F per hour) max,
without condensation