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14 Barracuda Serial ATA V Product Manual, Rev. B
• 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, write or seek), the
standby timer is reinitialized and begins counting down from its specified
delay times to zero. If the standby timer reaches zero before any drive
activity is required, the drive makes a transition to Standby mode. In both
Idle and Standby mode, the drive accepts all commands and returns to
Active mode when disc access is necessary.
2.10 Environmental specifications
2.10.1 Ambient temperature
Ambient temperature is defined as the temperature of the environment
immediately surrounding the drive. Actual drive case temperature should not
exceed
69°C (156°F) within the operating ambient conditions. Recom-
mended measurement locations are shown in Figure 3 on page 23.
Above 1,000 feet (305 meters), the maximum temperature is derated linearly
to 112°F (44°C) at 10,000 feet (3,048 meters).
Operating 0° to 60°C (32° to 140°F)
Nonoperating –40° to 70°C (–40° to 158°F)