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The USB-disk drive with 2,5 ”100 Gbytes HDD

Evgenie Rudometov

Victor Rudometov

The modern computer market offers a considerable quantity of the arrangements which have come in the stead traditional bridgewares and an information storage. The transportable USB-disk drive Seagate Portable External Hard Drive which is hooked up to the computer by means of external bus USB 2.0 became one of such arrangements. The given disk drive is a convenient resource for storage and resocks of programs and data, as in case of usage of computers Desktop, and Notebook.

From development and implantation time microfloppy (3,5 ") diskettes with informational size of 1,44 Mb regularly played a role of the general-purpose carrier. Together with appropriate drives they many years were a convenient resource for durable storage of programs and data. Besides, thanks to the wide prevalence they fulfilled functions of the original general-purpose interface providing informational link between different computers that gave possibility of carrying over of programs and data.

However the size of this popular carrier has ceased to correspond for a long time already to permanently increasing possibilities of the computer industry and requirements of users. The replaced diskettes on this post and ZIP250 (200 Mb) from Iomega and LS-120 from Imation and O.R.Technology have not troubleshot carriers ZIP100 (100 Mb) . But also the optical carriers presented by CD-ROM and CD-RW, also could not become unconditional leaders. At the same time disks DVD step-by-step replacing them, predictably, soon will be superseded by more capacious optical carriers. All it speaks perfection and complicating of the system and applied software, demanding more and more capacious carriers. Really, any more the rarity files, whose size is gauged in gigabytes.

It is obvious, that the considerable quantity of carriers at copying of the information demands rather big efforts and time. Moreover, carriers cease to arrange by such important criterion, as dependability and the price. Considering these circumstances, becomes obvious, that alternative arrangements and, of course, new media are required.

Not pressing in technical parametres of the enumerated resources, it is necessary to mark, that all of them possess both conclusive advantages, and some limitations, and lacks.

As to resources for carrying over of programs and data in case of real great volumes of the information hard disk drives (HDD) remain champions as on information capacity, and low cost of storage of unit of the information. This circumstance is well known to numerous users of modern computers.

Certainly, between computers of programs and data it is possible to apply to carrying over successfully traditional HDD a form factor 3,5 ”. However their usage as portable resources is, to put it mildly, not so optimal. Much more conveniently and more operatively to use the compact arrangements which are created on the basis of HDD and hooked up to the computer by means of interface USB.

As an example it is possible to result the transportable USB-disk drives created and made by company Seagate. The arrangements fulfilled on the basis of HDD of form factors 3,5 concern such products ”, 2,5”, 1 ”. Each of products of the specified bars possesses the advantages, but only two last of three enumerated do not require additional power supply units as energy receive directly from port USB.

It is necessary to mark, that the high model with 1 ”HDD has been recently considered on pages of the given issuing. Queue of the high model created on the basis of HDD of a form factor 2,5” and 100 Gbytes having size now has come . The name of the given model - Seagate Portable External Hard Drive.

Package Seagate Portable External Hard Drive

USB-disk drive Seagate Portable External Hard Drive package is presented in a Fig. 1.

This package consists of following components:


        the Transportable USB-disk drive,

        the Cable of hooking up of the USB-disk drive to computer USB-ports. Thus the green plug is for an information transfer, dark blue - for the additional power supplies necessary in case of insufficient power supply through the dark blue plug. The second plug is necessary in case of usage of models of the notebooks which are not supporting to the full specifications USB 2.0,

        the Short description in several languages (except Russian),

        CD-ROM with the software.

Fig. 1. Package SeagatePortable External Hard Drive is presented in a Fig. 1.

Parametres Seagate Portable External Hard Drive

Short parametres high models SeagatePortable External Hard Drive are resulted (now) in Table 1.

Table 1. Short parametres of USB-disk drive Portable External Hard Drive

Size, a Gbyte

To 100

The interface with the computer

USB 2.0, compatibility USB 1.1

Power supplies

Through USB

The sizes, mm

25 h 94 h 127

Weight, g


Noise level, db


Operating systems

Win XP/2000/ME, Mac OS 8.6, Win 98/SE

In arrangement Portable External Hard Drive the metal envelope providing high dependability, necessary for transportable arrangements uses.

Basis of USB-disk drives Portable External Hard Drive are 2,5-inch HDD Seagate. Depending on models disks of different sizes use. For topovoj the model which are now high in bar Portable External Hard Drive, it is applied HDD ST9100823A. Short parametres of it HDD are resulted in Table 2.

Table 2. Short parametres HDD ST9100823A

Size, a Gbyte


The interface

Ultra ATA/100

Quantity of disks/heads, sht


Speed of rotation of disks, rpm


Internal transfer rate, Mbit


The built in cache memory, Mb


Average access time, a msec


The sizes, mm

9,5 h 70 h 100

Weight, g


Power supplies, In

+5 (5 %)

Noise level, db


Guarantee, years


Transportable USB-disk drives Seagate Portable External Hard Drive are both for transportation, and for storage of programs and data. Thus they can be used for copying and arhivirovanija programs and data, their operative carrying over and durable storage, and also for installation and an applications launch. Arrangements of this type are convenient as resources of storage of programs and data for usage at various seminars, conferences and presentations. These arrangements can be used and as the additional arrangements of the information storage which has been hooked up to computers of type Desktop and Notebook.

It is necessary to mark, that transportable USB-disk drives Seagate Portable External Hard Drive can be used and as an external hard disk for operation with the confidential information which databases quite often concern, financial calculations, dogovory, reports, agreements, letters, etc . After the operation termination these arrangements can be easily disconnected from the computer and are hidden in the safe or even are taken with itself as dimensions, the weight and parametres of dependability of the given arrangements allow it. To carry them it is possible, for example, in a jacket pocket.

Realised in Seagate Portable External Hard Drive hardware-software resources of interface USB 2.0 do not demand installation of additional drivers. The given resources are compatible to all widespread operating systems and provide a data transfer high speed: speed limit of the interface — to 60 Mb per second.

Arrangement Seagate Portable External Hard Drive easily and was defined at once by WindowsXP operating system after its hooking up to the transportable computer. The menu fragment testifies to it the Manager of arrangements, resulted on a Fig. 2.

Fig. 2. A menu fragment the Manager of arrangements after hooking up to USB-disk drive PortableExternal Hard Drive notebook

Real parametres of transportable USB-disk drive Seagate Portable External Hard Drive can be defined in the course of testing, as it has been made. Results of the given testing are presented more low.

Testing PortableExternal Hard Drive

As a computer platform for testing of transportable USB-disk drive SeagatePortable External Hard Drive in size of 100 Gbytes compact notebook Fujitsu-Siemens AMILO M 1420 used. Into its structure enter:

        Motherboard FUJITSUSIEMENS Montara-GML version FAB-2 (the processor bus of 400 MHz, Intel chip set 855GME and ICH4-M),

        the Processor of Intel of Pentium M 735 with kernel Dothan (90 nanometers) and clock rate 1,7 GHz,

        the Disk drive on hard 2,5-inch magnetic disks in size FUJITSUMHT2080AT of 80 Gbytes,

        Units of dynamic storage SO-DIMM DDR333 units, 512 Mb (extends to 1 Gbytes),

        ATI MOBILITY RADEON 9600 PRO c 128 Videoadapter Mb RAM (chip ATI M10P), the supported permission of the external screen monitor 1600х1200,

        DVD+RW RW8165 (DVD 8x / DVD+R 4x / DVD+RW 2.4x / CD 24x / CD-R 16x/CD-RW 8x),

        the Operating system of Microsoft Windows XP HomeEdition.

After hooking up Portable External Hard Drive to a notebook in a window My computer appears a new logical disk. By means of a choice of appropriate options it is possible to output on the display screen of value of the information capacity making 93,1 Gbytes (   100 000 000 000 byte). About high-speed parametres it is possible to judge data resulted in Table 3 - Table 5 and in a Fig. 3 – a Fig. 5. As standard USB-disk drives 1-inch arrangement Seagate of 5 Gbytes and arrangement FlashDisk of 64 Mb have been selected  .

Fig. 3. The schedule of linear data reading from external USB-disk drive PortableExternal Hard Drive

Table 3. Results of testing of external USB-disk drive Seagate Portable External Hard Drive

WinBench 99


Business Disk WinMark 99


Disk Access Time (Milliseconds)


Disk CPU Utilization (Percent Used)


Disk Playback/Bus:Overall


Disk Playback/HE:AVS/Express 3.4


Disk Playback/HE:FrontPage 98


Disk Playback/HE:MicroStation SE


Disk Playback/HE:Overall


Disk Playback/HE:Photoshop 4.0


Disk Playback/HE:Premiere 4.2


Disk Playback/HE:Sound Forge 4.0


Disk Playback/HE:Visual C ++ 5.0


Disk Playback/Removable Media


Disk Transfer Rate:Beginning


Disk Transfer Rate:End


High-End Disk WinMark 99


Table 4. Productivity of USB-disk drives


Disk Transfer Rate:End (1000 bytes per second)

Disk Transfer Rate:Beginning (1000 bytes per second)

FlashDisk 64Mb



Seagate 5Gb



Seagate 100Gb



Fig. 4. The Transfer rate

Table 5. Access time of USB-disk drives


Seagate 100Gb

Seagate 5Gb

FlashDisk 64Mb

Disk Access Time (ms)




Fig. 5. Access time

In summary it is necessary to mark, that thanks to the high technical parametres and consumer properties of model Seagate Portable External Hard Drive will undoubtedly find the buyers.

Transportable USB-disk drive Seagate Portable External Hard Drive has been given by company EAST SIDE Consulting, notebook Fujitsu-Siemens AMILOM 1420 — the Moscow representation of company Fujitsu-Siemens

Article is published in log the Computer the Price (Computer Price).

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