Hitachi HDS721025CLA382 Benutzerhandbuch
Hitachi hard disk drive specifications
43
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.
in the following table. The sound power emission levels are measured in accordance with ISO 7779.
Mode
Typical / Max
1 disk model
2 disk model
Idle
2.5 / 2.7
2.4 / 2.5
Operating
Performance seek mode
N/A
2.9/ 3.1
Quiet seek mode
2.7 / 3.0
2.5 / 2.7
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:
the appropriate hard disk drive assembly drawing:
A label containing the H
itachi
logo, the H
itachi Global Storage Technologies
part number, and the
statement
“Made by H
itachi Global Storage Technologies
Inc.” or H
itachi Global Storage
Technologies
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 the jumper pin description
A user designed label per agreement
The above labels may be integrated with other labels.