Service Life And Usage Condition; Preventive Maintenance; Load/Unload - Hitachi IC25N040ATMR04-0 - Travelstar 40GB Laptop Hard Drive 9.5mm 2.5 Inch Notebook HDD Specifications

common mode noise or voltage level difference between the system frame and power cable ground or AT interface
cable ground should be in the allowable level specified in the power requirement section.

6.3.4 Service life and usage condition

The drive is designed to be used under the following conditions:
• The drive should be operated within specifications of shock, vibration, temperature, humidity, altitude, and
magnetic field.
• The drive should be protected from ESD.
• The breathing hole in the top cover of the drive should not be covered.
• Force should not be applied to the cover of the drive.
• The specified power requirements of the drive should be satisfied.
• The drive frame should be grounded electrically to the system through four screws.
• The drive should be mounted with the recommended screw depth and torque.
• The interface physical and electrical requirements of the drive should satisfy ATA-6.
• The power-off sequence of the drive should comply with the required power off sequence described in Sec-
tion 6.3.6.2, "Required Power-Off Sequence" on page 30.
Service life of the drive is approximately 5 years or 20,000 power on hours, which comes first, under the following
assumptions:
• Less than 333 power on hours per month.
• Seeking/Writing/Reading operation is less than 20% of power on hours.
This does not represent any warranty or warranty period. Applicable warranty and warranty period are covered by
the purchase agreement.

6.3.5 Preventive maintenance

None

6.3.6 Load/unload

The product supports a minimum of 300,000 normal load/unloads.
Load/unload is a functional mechanism of the hard disk drive. It is controlled by the drive micro code. Specifically,
unloading of the heads is invoked by the following commands:
• Hard reset
• Standby
• Standby immediate
• Sleep
Load/unload is also invoked as one of the idle modes of the drive.
The specified start/stop life of the product assumes that load/unload is operated normally, not in emergency mode.
6.3.6.1 Emergency unload
When hard disk drive power is interrupted while the heads are still loaded the micro code cannot operate and the
normal 5-volt power is unavailable to unload the heads. In this case, normal unload is not possible. The heads are
Travelstar 80GN Hard Disk Drive Specification
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