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Hitachi HDS723020BLA642 Acoustics, Sound power level, Discrete tone penalty, Weighted sound power

Models: HDS723020BLA642

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7K200 SATA OEM Specification

6.6Acoustics

6.6.1Sound power level

The criteria of A-weighted sound power level are described below.

Measurements are to be taken in accordance with ISO 7779. The mean of the sample of 40 drives is to be less than the typical value. Each drive is to be less than the maximum value. The drives are to meet this requirement in both board down orientations.

A-weighted Sound Power

200GB, 160GB 120GB models

Idle

Operating

100GB, 80GBmodels

Idle

Operating

Table 22. Weighted sound power

Typical (Bels)

2.5.

2.9

2.2

2.6

Maximum (Bels)

2.8

3.4

2.5

3.1

The background power levels of the acoustic test chamber for each octave band are to be recorded.

Sound power tests are to be conducted with the drive supported by spacers so that the lower surface of the drive be located 25±3 mm above from the chamber floor. No sound absorbing material shall be used.

The acoustical characteristics of the disk drive are measured under the following conditions:

Mode definitions

Idle mode: Power on, disks spinning, track following, unit ready to receive and respond to control line commands.

Operating mode: Continuous random cylinder selection and seek operation of the actuator with a dwell time at each cylinder. The seek rate for the drive can be calculated as shown below.

Ns = 0.4/(Tt + T1)

where:

Ns = average seek rate in seeks/s

Tt = published seek time from one random track to another without including rotational latency

T1= equivalent time in seconds for the drive to rotate by half a revolution

6.6.2Discrete tone penalty

Discrete tone penalties are added to the A-weighted sound power (Lw) with the following formula only when determining compliance.

Lwt(spec) = Lw + 0.1Pt + 0.3 < 4.0 (Bels)

where

Lw = A-weighted sound power level

Pt = Value of desecrate tone penalty = dLt – 6.0(dBA)

dLt = Tone-to-noise ratio taken in accordance with ISO 7779 at each octave band.

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Hitachi HDS723020BLA642 manual Acoustics, Sound power level, Discrete tone penalty, Weighted sound power
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HDS723020BLA642 specifications

The Hitachi HDS723020BLA642 is a high-performance hard disk drive that exemplifies the balance between reliability and advanced technology, making it an excellent choice for a range of applications, from desktop computers to enterprise storage solutions. This 2TB SATA hard drive is designed to meet the growing data storage needs of users who demand both speed and efficiency.

One of the key features of the HDS723020BLA642 is its impressive rotational speed of 7200 RPM. This speed facilitates faster data access and improved overall performance, significantly enhancing the user experience during data-intensive operations such as gaming, video editing, and large file transfers. Coupled with a SATA III interface, this drive facilitates data transfer rates of up to 6 Gb/s, providing an efficient conduit for moving data quickly between the hard drive and the motherboard.

The drive comes equipped with a large 64 MB cache, which plays a crucial role in buffering read and write operations. This substantial amount of cache memory allows the drive to temporarily store frequently accessed data, leading to reduced latency and enabling smoother multitasking capabilities. Users will benefit from faster load times and reduced wait periods when working with large files.

Reliability is another defining characteristic of the HDS723020BLA642. Hitachi, now a part of Western Digital, has a longstanding reputation for producing durable hard drives. This model incorporates advanced technologies, such as the Fluid Dynamic Bearing (FDB) for quieter operation and better longevity. The drive also features an enhanced error recovery system that minimizes the risk of data loss, making it a suitable option for both personal and professional use.

In terms of power efficiency, the HDS723020BLA642 is designed to consume less power during operation compared to older hard drive models. This efficiency not only helps in reducing operational costs but also contributes to a longer lifespan for the drive itself.

Overall, the Hitachi HDS723020BLA642 hard drive combines speed, reliability, and efficiency into a compact package, making it an ideal choice for users needing a substantial amount of storage without compromising on performance. Whether for upgrading an existing system or building a new one, this drive offers a blend of technology and durability that caters to modern storage demands.