Environmental Specifications; Ambient Temperature; Temperature Gradient; Humidity - Seagate ST4000DM000 Product Manual

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• Idle mode
The buffer remains enabled, and the drive accepts all commands and returns to Active mode any time disk
access is necessary.
• Standby mode
The drive enters Standby mode when the host sends a Standby Immediate command. If the host has set the
standby timer, the drive can also enter Standby mode automatically after the drive has been inactive for a
specifiable length of time. The standby timer delay is established using a Standby or Idle command. In
Standby mode, the drive buffer is enabled, the heads are parked and the spindle is at rest. The drive accepts
all commands and returns to Active mode any time disk 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, 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 disk access is necessary.

2.9 Environmental specifications

This section provides the temperature, humidty, shock, and vibration specifications for Desktop HDDs. Ambient
temperature is defined as the temperature of the environment immediately surrounding the drive. Above 1000ft.
(305 meters), the maximum temerature is derated linearly by 1°C every 1000 ft. Refer to
for base plate measurement location.

2.9.1 Ambient Temperature

Operating 0° to 60°C (32° to 140°F)
Non-operating –40° to 70°C (–40° to 158°F)

2.9.2 Temperature gradient

Operating 20°C per hour (68°F per hour max), without condensation
Non-operating
30°C per hour (86°F per hour max)

2.9.3 Humidity

2.9.3.1 Relative humidity
Operating 5% to 90% non-condensing (30% per hour max)
Nonoperating 5% to 95% non-condensing (30% per hour max)
2.9.3.2 Wet bulb temperature
Operating 37.7°C (99.9°F max)
Non-operating 40°C (104°F max)
Desktop HDD SATA Product Manual, Rev. C
Drive Specifications
Section 3.4 on page 24
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