Product manual

Cheetah 4LP FC Product Manual, Rev. A 19
6.4.1 Temperature
a. Operating
The MTBF specification for the drive (1,000,000 hours) is based on operating at a local ambient tempera-
ture of 77°F (25°C). Occasional excursions to drive ambient temperatures to 122°F (50°C) may occur with-
out impact to specified MTBF. The enclosure for the drive should be designed such that the case
temperatures at the locations specified in Figures 8 and 9 are not exceeded. Air flow may be needed to
achieve these temperature values. Continual or sustained operation at case temperatures above these val-
ues will degrade MTBF.
The drive meets all specifications over a 41°F to 113°F (5°C to 45°C) drive ambient temperature range with
a maximum gradient of 36°F (20°C) per hour when the case temperature limits specified above are not
exceeded.
b. Non-operating
Non-operating temperature should remain between –40°F to 158°F (–40°C to 70°C) package ambient with
a maximum gradient of 36°F (20°C) per hour. This assumes that the drive is packaged in the shipping con-
tainer designed by Seagate.
6.4.2 Relative humidity
The values below assume that no condensation on the drive occurs.
a. Operating
5% to 95% relative humidity with a maximum gradient of 10% per hour.
b. Non-operating
5% to 95% relative humidity with a maximum gradient of 10% per hour.
6.4.3 Effective altitude (sea level reference)
a. Operating
–1,000 to +10,000 feet (–305 to +3,048 meters)
b. Non-operating
–1,000 to +40,000 feet (–305 to +12,210 meters)
6.4.4 Shock and vibration
Shock and vibration limits specified in this document are measured directly on the drive chassis. If the drive is
installed in an enclosure to which the stated shock and/or vibration criteria are applied, resonances may occur
internally to the enclosure resulting in drive movement in excess of the stated limits. If this situation is appar-
ent, it may be necessary to modify the enclosure to minimize drive movement.
The limits of shock and vibration defined within this document are specified with the drive mounted in a vertical
or horizontal position.
6.4.4.1 Shock
a. Operating (normal)
The drive, as installed for normal operation, will operate error free while subjected to intermittent shock not
exceeding 2.0 Gs at a maximum duration of 11 msec (half sinewave). Shock may be applied in the X, Y, or
Z axis.
b. Operating (abnormal)
Equipment as installed for normal operation will not incur physical damage while subjected to intermittent
shock not exceeding 10 Gs at a maximum duration of 11 msec (half sinewave). Shock occurring at abnor-
mal levels may promote degraded operational performance during the abnormal shock period. Specified
operational performance will continue when normal operating shock levels resume. Shock may be applied
in the X, Y, or Z axis. Shock is not to be repeated more than two times per second.