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CONSTELLATION ES.2 SERIAL ATA PRODUCT MANUAL, REV. H 15
Setting power condition timer values less than the manufacturer specified defaults or issuing the EPC "Go to Power Condition"
subcommand at a rate exceeding the default timers may limit this products reliability and data integrity.
PowerChoice Supported Extended Power Condition Feature Subcommands
EPC S
UBCOMMAND DESCRIPTION
00
H
Restore Power Condition Settings
01
H
Go to Power Condition
02
H
Set Power Condition Timer
03
H
Set Power Condition State
PowerChoice Supported Extended Power Condition Indentifiers
POWER CONDITION
IDENTIFIERS
POWER CONDITION NAME
00
H
Standby_z
01 - 80
H
Reserved
81
H
Idle_a
82
H
Idle_b
83
H
Idle_c
84 - FE
H
Reserved
FF
H
All EPC Power Conditions
2.9 ENVIRONMENTAL LIMITS
Temperature and humidity values experienced by the drive must be such that condensation does not occur on any drive part. Altitude and
atmospheric pressure specifications are referenced to a standard day at 58.7°F (14.8°C). Maximum wet bulb temperature is 82°F (28°C).
2.9.1 Temperature
a. Operating
The drive meets the operating specifications over a 41°F to 140°F (5°C to 60°C) drive case temperature range with a
maximum temperature gradient of 36°F (20°C) per hour.
The maximum allowable drive case temperature is 60°C. See Figure 3 for HDA case temperature measurement location
The MTBF specification for the drive assumes the operating environment is designed to maintain nominal case
temperature. The rated MTBF is based upon a sustained case temperature of 104°F (40°C). Occasional excursions in
operating temperature between the rated MTBF temperature and the maximum drive operating case temperature may
occur without impact to the rated MTBF temperature. However, continual or sustained operation at case temperatures
beyond the rated MTBF temperature will degrade the drive MTBF and reduce product reliability.
Air flow may be required to achieve consistent nominal case temperature values (see Section 3.4). To confirm that the
required cooling is provided for the electronics and HDA, place the drive in its final mechanical configuration, and perform
random write/read operations. After the temperatures stabilize, measure the case temperature of the drive.
POWER CONDITION NAME MANUFACTURER DEFAULT TIMER VALUES
Idle_a 2 min
Idle_b 4 min
Idle_c 10 min
Standby_z 15 min