Seagate ST380023AS Manual download pdf (Page 26)

16 Barracuda Serial ATA V Product Manual, Rev. B

2.10.6 Vibration

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.

2.10.6.1 Operating vibration

The maximum vibration levels that the drive may experience while meeting

the performance standards specified in this document are specified below.

2.10.6.2 Nonoperating vibration

The maximum nonoperating vibration levels that the drive may experience

without incurring physical damage or degradation in performance when sub-

sequently put into operation are specified below.

2.11 Drive 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.

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)

5–22 Hz 0.25-inch displacement (zero to peak)

22–350 Hz 0.5 Gs acceleration (zero to peak)

5–22 Hz 1.0-inch displacement (zero to peak)

22–350 Hz 5.0 Gs acceleration (zero to peak)

Table 4: Fluid Dynamic Bearing (FDB) motor acoustics

Acoustic mode

Models Idle* Quiet seek Performance seek

ST3120023AS

ST380023AS

2.8 bels (typ)

3.0 bels (max)

2.8 bels (typ)

3.0 bels (max)

3.3 bels (typ)

3.6 bels (max)

ST360015AS 2.1 bels (typ)

<2.5 bels (max)

2.4 bels (typ)

2.8 bels (max)

3.0 bels (typ)

3.4 bels (max)

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Seagate ST380023AS Manual Page 26