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External hard disk of company Seagate

Evgenie Rudometov

Expanding the nomenclature of the products, company Seagate which is the world's largest manufacturer of hard disk drives, has released ExternalHard Drive  — the peripheral of writing and storage of the computer information

The high technologies which are presented by modern resources of information processing and being a basis of a modern civilisation, all penetrate into our life more deeply. Thanks to perfection of solid-state technologies and computer architectures functionality of modern computers fast grows. It allows to solve more and more the challenges linked to information processing which sizes permanently grow. And if all several years ago the sizes of files were gauged in kilobytes and in rare instances in mbytes now do not call especial surprise gigabajtnye objects.

However the information is necessary for storing somewhere. For this reason the size of hard disk drives, the blessing grows, that it is promoted by development of appropriate processing techniques. As a result, the size of disk subsystems already quite often reaches tens, and recently already and hundreds gigabytes.

Really, for example, the hour video file of standard MiniDV possesses the size about 15 Gbytes while even new notebooks are offered basically with HDD 40-60 Gbytes. And if for desktop systems it is possible to bring an attention to the question on changeover of the disk drive on more capacious model or usage of the array built in HDD such solutions are often unacceptable for transportable computers. The impossibility of usage of several disk drives within the limits of the transportable computer speaks the design features linked to minimisation of dimensions and weight. The size of 2,5-inch models HDD is limited now by 160 value of Gbytes. In the majority the size of disk drives essentially is less and it is rather fast settled, besides, changeover of the drive to carry out forces of the user difficultly enough.

In addition to it especially valuable information is necessary for duplicating somewhere. Usually for Backup use the special arrangements working with magnetic tapes, and also magnetic, optical, magneto-optic disks and appropriate drives. Each of the named arrangements and carriers possess the merits and demerits which are often enough shined on pages of specialised issuings., Perhaps, their lack the insufficient information capacity of similar arrangements of an information storage is main.

Here besides irreplaceable arrangements are disk drives of a high capacity which can be used successfully as with desktop computers, and notebooks.

Package External Hard Drive

Responding to requirements of the market company Seagate has designed and has released a number of models External Hard Drive  — peripherals of writing and storage of the computer information, supplied the appropriate software, the documentation, the power supply from a network of an alternate current power 220 In and appropriate power and the Basis of the given arrangements are disk drives on 3,5-inch hard magnetic disks possessing various information capacity and the speed of rotation of slices of 7200 rpm. As computer and arrangement External Hard Drive communication facilities external serial interfaces USB 2.0 and IEEE 1394а (WireFire) use .

High model is the arrangement with 3,5-inch hard disk Barracuda of the bar in 10 size of 750 Gbytes. Hard disk parametres are resulted in table 1.

Table 2. Key parametres HDD of 750 Gbytes Seagate Barracuda 7200.10

Model HDD


Information capacity, a Gbyte


Speed of rotation of slices, rpm


The Cache memory, Mb


The interface


Maximum transfer rate, interface, Mb per second


Operating temperature, With

To 60

By means of built in serial interfaces USB 2.0 with a transfer rate of the information to 480 Mbit/with and IEEE 1394а, known also as FireWire and providing a transfer rate to 400 Mbit/with, the disk drive can be hooked up to servers, desktop computers and notebooks.

Appearance of external disk drive External Hard Drive hooked up to a notebook is presented in a Fig. 1.

Fig. 1. External disk drive External Hard Drive hooked up to a notebook

Testing External Hard Drive

·         In testing of the external disk drive notebook Fujitsu Siemens Amilo M1420 (the processor — IntelPentium M 735 with kernel Dothan and clock rate of 1,7 GHz, a chip set — 855GME+ICH4M, the built in videoadapter — ATIMOBILITY RADEON 9600 PROc 128 Mb RAM, dynamic storage — 512 Mb DDR333, HDD  — 80 Gbytes), the operating system of Windows XP has been used         .

After hooking up to the computer of arrangement External Hard Drive it at once were defined by the operating system (a Fig. 2).

Fig. 2. A menu fragment «the Manager of arrangements» after hooking up to a notebook external накопителяExternal Hard Drive 750 Gbytes by means of serial interface USB 2.0

Results of testing are resulted in table 2.

Table 2. Results of testing



Disk Access Time, mc


Disk Transfer Rate: End, Kb\s


Disk Transfer Rate: Beginning, Kb\s


High-End Disk WinMark 99


In summary it is necessary to mark, that the presented results of testing of arrangement External Hard Drive show rather high high-speed parametres of the given arrangement limited exclusively to capacity of the consecutive bus. The high size of the external disk drive External Hard Drive constructed on the basis of a hard disk of 750 Gbytes provides the essential extension of an information field of the computer for external storage of programs and data.

External disk drive External Hard Drive in size of 750 Gbytes it is given by company EAST SIDE Consulting

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