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CONSTELLATION ES SERIAL ATA PRODUCT MANUAL, REV. F 19
2.10 ACOUSTICS
Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All measurements are consistent with
ISO document 7779. Sound power measurements are taken under essentially free-field conditions over a reflecting plane. For all tests, the
drive is oriented with the cover facing upward.
Note. For seek mode tests, the drive is placed in seek mode only. The number of seeks per second is defined by the following equa-
tion:
(Number of seeks per second = 0.4 / (average latency + average access time)
Table 6 Fluid Dynamic Bearing (FDB) motor acoustics
Idle* Performance seek
2TB models 2.7 bels (typ)
2.9 bels (max)
3.0 bels (typ)
3.3 bels (max)
1TB models 2.2 bels (typ)
2.5 bels (max)
2.8 bels (typ)
3.1 bels (max)
500GB models 1.9 bels (typ)
2.3 bels (max)
2.7 bels (typ)
3.0 bels (max)
*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.
2.11 TEST FOR PROMINENT DISCRETE TONES (PDTS)
Seagate follows the ECMA-74 standards for measurement and identification of PDTs. An exception to this process is the use of the
absolute threshold of hearing. Seagate uses this threshold curve (originated in ISO 389-7) to discern tone audibility and to compensate for
the inaudible components of sound prior to computation of tone ratios according to Annex D of the ECMA-74 standards.
2.12 ELECTROMAGNETIC 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 7 Radio frequency environments
Test
Description Performance level Reference standard
Electrostatic
discharge
Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV B EN 61000-4-2: 95
Radiated RF
immunity
80 to 1000 MHz, 3 V/m,
80% AM with 1 kHz sine
900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz
A
EN 61000-4-3: 96
ENV 50204: 95
Electrical fast
transient
± 1 kV on AC mains, ± 0.5 kV on external I/O B EN 61000-4-4: 95
Surge immunity ± 1 kV differential, ± 2 kV common, AC mains B EN 61000-4-5: 95
Conducted RF
immunity
150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine A EN 61000-4-6: 97
Voltage dips,
interrupts
0% open, 5 seconds
0% short, 5 seconds
40%, 0.10 seconds
70%, 0.01 seconds
C
C
C
B
EN 61000-4-11: 94