2.11Acoustics

Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All mea- surements 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 3:

Drive level acoustics

 

 

 

 

Acoustic mode

 

 

 

 

 

 

Idle*

 

Quiet Seek

Performance Seek

 

 

 

 

2.4 bels (typ)

 

2.6 bels (typ)

2.9 bels (typ)

2.6 bels (max)

2.8 bels (max)

3.1 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.

2.12Electromagnetic immunity

When properly installed in a representative host system, the drive operates without errors or degradation in performance when subjected to the rradio frequency (RF) environments defined in the following table:

Table 4:

Electromagnetic immunity

 

 

 

 

 

 

 

 

 

 

Performance

Reference

Test

 

Description

level

standard

 

 

 

 

Electrostatic discharge

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

B

EN 61000-4-2: 95

 

 

 

 

Radiated RF immunity

80 to 2,000 MHz, 10 V/m,

A

EN 61000-4-3: 96

 

 

80% AM with 1 kHz sine

 

 

 

 

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

 

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

A

EN 61000-4-6: 97

 

 

sine

 

 

 

 

 

 

Power Frequency H-field

1 A/m, 50Hz/60Hz, 3 axes

A

EN 61000-4-8: 97

immunity

 

 

 

 

 

 

 

 

Voltage dips, interrupts

30% Reduction for 25 cycles

C

EN 61000-4-11: 94

 

 

>95% Reduction for 250 cycles

C

 

 

 

>95%, 0.5 cycles

B

 

 

 

 

 

 

A - 1) No upset or degradation in performance beyond manufacturer’s specified limits.

2) No data loss.

B - 1) Unit self recovers without user intervention.

2) No data loss.

C - 1) Upset OK provided that unit will function after user intervention.

12

Momentus 5400.2 Blade Server Product Manual, Rev. B

Page 17 Page 19
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Seagate ST9408114AB, ST9808211AB, ST960822AB, ST9100823AB manual Acoustics, Electromagnetic immunity, Drive level acoustics
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ST9808211AB, ST9100823AB, ST9408114AB, ST960822AB specifications

The Seagate ST960822AB, ST9408114AB, ST9100823AB, and ST9808211AB are notable hard disk drives (HDDs) that have made significant contributions to data storage technology. These drives are part of Seagate's extensive lineup, known for their reliability, performance, and innovative features.

The ST960822AB is a 2.5-inch HDD with a storage capacity of 60 GB. It is designed primarily for mobile computing applications, such as laptops and external drives. This model features a low power consumption design that enhances battery life, making it an ideal choice for portable devices. Its data transfer rates are competitive for its class, ensuring fast access to files.

Next, the ST9408114AB presents a slightly higher capacity of 40 GB, also within the 2.5-inch form factor. This drive was engineered for entry-level laptops and external storage solutions. Its Fluid Dynamic Bearing (FDB) technology allows for quieter operation and reduced vibration. With a 5400 RPM speed, it provides adequate performance for everyday tasks, including document storage and multimedia playback.

The ST9100823AB steps into the spotlight with a capacity of 80 GB, catering to users requiring more storage space for games, documents, and multimedia files. This HDD offers enhanced data integrity through Seagate's Advanced Power Management technology, which reduces power consumption without sacrificing performance. The ST9100823AB's consistent performance makes it suitable for both personal and professional use.

Lastly, there is the ST9808211AB, offering 80 GB of storage in a 2.5-inch format. It leverages similar technology as its counterparts but with improved data caching algorithms that allow for quicker access to frequently used files. This HDD is also built with durability in mind, suitable for environments that may experience shocks or vibrations.

All four models incorporate Seagate's commitment to quality with a focus on reliability and efficiency. They are equipped with features that prioritize speed, noise reduction, and power efficiency, making them excellent choices for varied applications in personal computing, gaming, and mobile storage. Collectively, the ST960822AB, ST9408114AB, ST9100823AB, and ST9808211AB represent a significant advancement in hard drive technology, serving users with diverse storage needs effectively.
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