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 4:

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 5:

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.

Momentus 5400.2 Product Manual, Rev. D

13

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Seagate ST9100823A, ST9808211A, ST960822A, ST9408114A, ST9308110A Acoustics, Electromagnetic immunity, Drive level acoustics
Page 18 Page 20

ST9408114A, ST9808211A, ST9308110A, ST9100823A, ST960822A specifications

Seagate has long been a leader in the hard disk drive industry, and its array of models, such as ST960822A, ST9100823A, ST9308110A, ST9808211A, and ST9408114A, exemplifies the company's commitment to innovation, reliability, and performance. Each of these models offers unique features and specifications that cater to a variety of storage needs.

The Seagate ST960822A stands out with 60GB capacity and a 5400 RPM spindle speed. It employs the Ultra ATA/100 interface, facilitating rapid data transfer rates up to 100MB/s. This model is designed for compact systems and provides ample storage for files, applications, and multimedia. Its advanced power management features also help in reducing energy consumption, making it an efficient choice for mobile and desktop computing.

Moving on to the ST9100823A, this drive offers a larger storage capacity of 100GB, also operating at 5400 RPM. It incorporates the Serial ATA interface, which enhances the drive's performance and allows for easier connection in modern computer systems. The ST9100823A is built with Seagate’s Quiet Airflow technology, ensuring quieter operations, while its rugged design promotes endurance and durability, making it suitable for both desktop and external storage uses.

The ST9308110A takes performance up a notch with a capacity of 300GB. This model leverages the SATA interface, providing faster data throughput, making it ideal for data-intensive applications including gaming and video editing. It features 8MB cache memory, which aids in quicker data retrieval and overall system responsiveness. This drive is a solid choice for users seeking high performance without sacrificing storage space.

Next, the ST9808211A expands on storage capabilities with 80GB capacity. Like the previous models, it runs at a speed of 5400 RPM, but its enhanced caching mechanisms optimize read and write operations. The drive is particularly suited for multimedia applications, where speed and storage are paramount, ensuring that users can store and retrieve large files seamlessly.

Lastly, the ST9408114A features a compact 40GB capacity, yet delivers exceptional speed with its 7200 RPM mechanism. This drive is tailored toward performance-oriented applications, such as gaming and high-performance computing scenarios. The combination of its increased RPM and fast access times make it a robust choice for users desiring responsiveness in their systems.

Collectively, these Seagate models embody a range of technologies and characteristics, from the ATA interface to advanced power management, making them suitable for a variety of applications. Whether one needs high capacity, enhanced performance, or reliability, Seagate continues to offer drives that meet diverse storage requirements in an increasingly data-driven world.
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