Seagate BarraCuda Product Manual, Rev. A

17

www.seagate.com

Drive Specifications

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.

*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.

2.10.1 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.

2.11 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 Table 5.

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 4

Fluid Dynamic Bearing (FDB) motor acoustics

Idle*

Seek

3 Disks

(3TB, 2TB)

2.4 bels (typical)

2.6 bels (max)

2.6 bels (typical)

2.7 bels (max)

2 Disks

(2TB)

1 Disk

(1TB and 500GB)

2.2 bels (typical)

2.4 bels (max)

2.4 bels (typical)

2.5 bels (max)

Table 5

Radio frequency environments

Test

Description

Performance

level

Reference

standard

Electrostatic discharge

Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV

B

EN61000-4-2: 95

Radiated RF immunity

80MHz to 1,000MHz, 3 V/m,

80% AM with 1kHz sine

900MHz, 3 V/m, 50% pulse modulation @ 200Hz

A

EN61000-4-3: 96

ENV50204: 95

Electrical fast transient

± 1 kV on AC mains, ± 0.5 kV on external I/O

B

EN61000-4-4: 95

Surge immunity

± 1 kV differential, ± 2 kV common,

AC mains

B

EN61000-4-5: 95

Conducted RF immunity

150kHz to 80MHz, 3 Vrms, 80% AM with 1kHz sine

A

EN61000-4-6: 97

Voltage dips, interrupts

0% open, 5 seconds

0% short, 5 seconds

40%, 0.10 seconds

70%, 0.01 seconds

C

C

C

B

EN61000-4-11: 94