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2.9Acoustics
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 |
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| Idle* | Performance Seek | Quiet Seek | |
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1000 GB model | 2.9 bels (typ) | 3.2 bels (typ) | 3.1 bels (typ) | ||
3.1 bels (max) | 3.3 bels (max) | 3.2 bels (max) | |||
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640 GB models | 2.7 bels (typ) | 3.1 bels (typ) | 3.0 bels (typ) | ||
2.9 bels (max) | 3.2 bels (max) | 3.1 bels (max) | |||
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320 & 160 GB models | 2.5 bels (typ) | — | 2.6 bels (typ) | ||
2.7 bels (max) | — | 2.8 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.
2.9.1Test for Prominent Discrete Tones (PDTs)
Seagate follows the
2.10Electromagnetic 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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Test |
| Description | Performance level | Reference standard |
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Electrostatic |
| Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV | B | EN |
discharge |
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Radiated RF |
| 80 to 1,000 MHz, 3 V/m, | A | EN |
immunity |
| 80% AM with 1 kHz sine |
| ENV 50204: 95 |
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| 900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz |
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Electrical fast | ± 1 kV on AC mains, ± 0.5 kV on external I/O | B | EN | |
transient |
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Surge immunity | ± 1 kV differential, ± 2 kV common, AC mains | B | EN | |
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Conducted RF | 150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine | A | EN | |
immunity |
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Voltage dips, |
| 0% open, 5 seconds | C | EN |
interrupts |
| 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 7200.11 Serial ATA Product Manual, Rev. B | 15 |