1.11 Acoustics
This table shows the overall A-weighted sound power and sound pres-
sure levels for the drives. All measurements are generally consistent with
ISO document 7779. Acoustic measurements are taken under essen-
tially free-field conditions over a reflecting plane. The drive is oriented
with the top cover up for all tests.
Overall A-weighted Value Idle Seek
Sound power, typ (bels) 3.4 4.0
Sound power, max (bels) 3.7 4.3
Sound pressure, typ (dBA) 27 30
Sound pressure, max (dBA) 30 33
1.12 Reliability
Read error rates are measured with automatic retries and data correction
with ECC enabled and all flaws reallocated. The mean time between
failures (MTBF) is measured at nominal power at sea level and an
ambient temperature of 35°C.
Nonrecoverable read errors
1 per 10
13
bits transferred
Seek errors
1 per 10
7
physical seeks
Contact stops and starts
50,000
MTBF
500,000 power-on hours
Service life
5 years
1.13 Agency listings
These drives are listed by agencies as follows:
•
Recognized in accordance with UL 478 and UL 1950
•
Certified to CSA C22.2 No. 220-M1986 and CSA C22.2 No. 950-
M1989
•
Certified to VDE 0806/05.90 and EN 60950/1.88 as tested by VDE
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