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6.7
Acoustics
The upper limit criteria of the octave sound power levels are given in Bels relative to one picowatt and are shown in
the following table. The sound power emission levels are measured in accordance with ISO 7779.
Mode
Idle
Operating
Table 26 Sound Power Levels
Mode definition:
Idle mode
The drive is powered on, disks spinning, track following, unit ready to receive and respond to
interface commands.
Operating mode
Continuous random cylinder selection and seek operation of the actuator with a dwell time at
each cylinder. The seek rate for the drive is to be calculated as shown below:
Dwell time = 0.5 x 60/RPM
Seek rate = 0.4 / (Average seek time + Dwell time)
6.8
Identification Labels
The following labels are affixed to every drive shipped from the drive manufacturing location in accordance with the
appropriate hard disk drive assembly drawing:
A label containing the WDC logo, the WDC part number, and the statement "Made by WDC, Ltd." or WDC
approved equivalent
A label containing the drive model number, the manufacturing date code, the formatted capacity, the place of
manufacture, UL/CSA/CE/RCM mark logos, and WEEE/China RoHS logos
A bar code label containing the drive serial number
A label containing the jumper pin description
A user designed label per agreement
The above labels may be integrated with other labels.
7200rpm (Typical / Max)
2.9 / 3.4
3.6 / 4.0
Western Digital Hard Disk Drive OEM Specification
31
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