Acoustics; Identification Labels; Table 47: Sound Power Levels - Hitachi HDT725025VLA380 - Deskstar 0A33423 T7K500 250GB SATA 7200RPM 8MB Cache Hard Drive Specifications

7.7 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
ISO7779.

Table 47: Sound power levels

Mode
Idle
Operating Performance seek mode
Quiet seek mode
Mode definitions
• Idle mode: The drive is powered on, disks spinning, track following, unit is ready to receive and
respond to control line 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 calculated with the following formula:
• Dwell time = 0.5 x 60/RPM
• Seek rate = 0.4 / (average seek time + dwell time)

7.8 Identification labels

The following labels are affixed to every drive:
• A label containing the Hitachi logo, the Hitachi Global Storage Technologies part number and the
statement " Made by Hitachi Global Storage Technologies Inc." or Hitachi Global Storage Technol-
ogies approved equivalent.
• A label containing the drive model number, the manufacturing date code, the formatted capacity,
the place of manufacture, UL/CSA/TUV/CE/C-Tick mark logos
• A bar code label containing the drive serial number
• A label containing jumper pin description
• A user designed label per agreement
The above labels may be integrated with other labels
Typical / Max
2 disk model
2.8 / 3.2
3.0 / 3.3
2.9 / 3.3
Deskstar T7K500 Hard Disk Drive Specification
63
3 disk model
3.0 / 3.4
3.2 / 3.5
3.1 / 3.5