Seagate ST3000VN000 Non-operating vibration, Acoustics, Test for Prominent Discrete Tones PDTs

www.seagate.com Drive Specifications

2.9.6.3Operating vibration

The maximum vibration levels that the drive may experience while meeting the performance standards specified in this document are specified below.

2Hz to 22Hz	0.25	Gs (Limited displacement)
22Hz to 350Hz	0.50	Gs
350Hz to 500Hz	0.25	Gs

All vibration specifications assume that the drive is mounted securely with the input vibration applied at the drive mounting screws. Vibration may be applied in the X, Y or Z axis. Throughput may vary if improperly mounted.

2.9.7 Non-operating vibration

The maximum non-operating vibration levels that the drive may experience without incurring physical damage or degradation in performance when subsequently put into operation are specified below.

5Hz to 22Hz	3.0	Gs (Limited displacement)
22Hz to 350Hz	3.0	Gs
350Hz to 500Hz	3.0	Gs

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 equation:

(Number of seeks per second = 0.4 / (average latency + average access time

Table 4 Fluid Dynamic Bearing (FDB) motor acoustics

	Idle*
2-Disk	1.9 bels (typ)
	2.0 bels (max)
4-Disk	2.3 bels (typical)
	2.4 bels (max)

Seek

2.1bels (typ)

2.2bels (max)

2.5bels (typical)

2.6bels (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.

2.10.1 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.

Table 5 Radio frequency environments

Test

Description

Performance level

Reference standard

NAS HDD Product Manual, Rev. A 19