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2.10Acoustics
Drive acoustics are measured as overall
Note. For seek mode tests, the drive is placed in seek mode only. The number of seeks per second is defined by the following equation:
(Number of seeks per second = 0.4 / (average latency + average access time)
Table 5: Fluid Dynamic Bearing (FDB) motor acoustics
Acoustic mode |
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Idle* | Performance seek |
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2.8 bels (typ) | 3.7 bels (typ) |
3.4 bels (max) | 3.9 bels (max) |
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*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and power to operational levels.
2.11Electromagnetic immunity
When properly installed in a representative host system, the drive operates without errors or degradation in performance when subjected to the radio frequency (RF) environments defined in the following table:
Table 6: | Radio frequency environments |
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| Performance | Reference |
Test |
| Description | level | standard |
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Electrostatic discharge | Contact, HCP, VCP: ± 4 kV; Air: | B | EN | |
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| ± 8 kV |
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Radiated RF immunity | 80 to 1,000 MHz, 3 V/m, | A | EN | |
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| 80% AM with 1 kHz sine |
| ENV 50204: 95 |
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| 900 MHz, 3 V/m, 50% pulse |
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| modulation @ 200 Hz |
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Electrical fast transient | ± 1 kV on AC mains, ± 0.5 kV on | B | EN | |
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| external I/O |
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Surge immunity | ± 1 kV differential, ± 2 kV com- | B | EN | |
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| mon, AC mains |
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Conducted RF immunity | 150 kHz to 80 MHz, 3 Vrms, | A | EN | |
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| 80% AM with 1 kHz sine |
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Voltage dips, interrupts | 0% open, 5 seconds | C | EN | |
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| 0% short, 5 seconds | C |
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| 40%, 0.10 seconds | C |
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| 70%, 0.01 seconds | B |
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Barracuda 7200.8 PATA Product Manual, Rev. F | 17 |