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Weekend Project: Flash Memory Hard Drive

Guide to Buying Hard Drives

Author: Andrew Gates

Apart from being one of the most essential parts of your computer, hard drive storage is constantly updating, both in terms of capacity of disk space and the physical size. When the time comes to upgrade your disk storage, a number of factors you take into account. Once the basic decisions about size, connectivity, speed and data transfer speed, and if you want an internal or external drive, you can Myshopping.com.au search through to find the most suitable make and model, and compare prices from different suppliers.

Hard Drives

How Hard Drive Works

The hard drive has a series of magnetized plates connected to a shaft. The shaft rotates the platters at a very fast speed, while a number of read / write heads scan over them both for information and writing. This information is transferred via a cable system, or Through a wireless connection to a hard disk controller, which in most systems is built into the motherboard, or in some systems installed a card. The information comes from the hard drive through its controller will be available to the components of your computer. The effectiveness of the unit hard drive (its performance) depends on the amount of its capacity remains unused, how well organized the data (known as fragmentation) and its data transfer rate, which in turn depends on the type of connection and unity of the rate of rotation.

Internal Hard Drives

Most computers in the house most basic models to more powerful servers, have installed an internal hard drive. Today's technology ensures that they are all generally fast, reliable and offer reliable storage capacity. Most of the computers have installation slots and cabling to allow installation of additional hard drive. This allows you to increase its storage capacity without giving up your current hard drive.

Internal Hard Drives

External Hard Drives

These units are essentially the same as the units installed on computers, but within a protective housing, portable case. This is a good solution for people who work remotely and the need to carry large amounts of data. If an external hard drive is your choice, make sure your computer is compatible with the interface that uses the hard drive. A card such as a FireWire card can help enhance the capacity of your computer. You can compare different brands of external hard drives and just Myshopping.com.au search the connection type, or other specifications.

External Hard Drives

Portable Hard Drives

There have been many advances in miniaturization of hardware components for laptop computing, and the hard drive technology is not left out of this loop. Portable hard drives feature exactly the same way as internal hard drives other teams, which are only designed to provide maximum efficiency in storage and package small as possible. For greater flexibility, some laptop computers come with removable hard drives that can be easily installed and removed. However, before buying a hard drive of your laptop, make sure the hard drive will meet the specifications of the rules of your computer, as many laptop hard drives owned and are not compatible with other brands and models.

Portable Hard Drives

Size

The hard disk drive storage system operational programs (games and applications), data from their work, and your digital music and movies. Most new equipment purchases with a minimum of 80 GB hard disk space, many have rather more. Hard disk space is one of those things, once you have it, you'll find a way to fill soon. There is a real golden rule, but consider the cost per gigabyte of storage as a means to guide your purchase. If you work with large files such as music, video and graphics, worthwhile to have a large storage space for your work. You can pay to have two hard drives, which houses all your programs and applications and another to save their work and projects.

You can compare the price of say a 160GB drive against two units of 80 GB. If one drive fails all is not lost. Today discs Hard though, are fairly robust pieces of equipment and if they are not abuse, will serve him well during a long period of time.

Up to 32GB Hard Drive

32-64 GB Hard Drive

64-100 GB Hard Drive

And more than 100 GB Hard Drive

Interface

One key distinguishing factor between the hard drives is the way they connect to your computer. There are a number of basic types of connection systems used with hard disk drives. Each type of connection has a number of differences in performance.

IDE (Integrated Drive Electronics)

This is the most common connection methods. Because the hard disk controller is in the drive instead of on the motherboard helps keep costs low. There are different IDE standards available. Above all, you need to buy Fastest possible that your computer can support. Most computers support a standard that is faster than the computer currently supports, and you can buy a faster car, and upgrade your equipment at a later time. The different IDE standards, in order from most basic to fastest, are:

ATA (Basic). Supports up to two hard drives and offers a 16-bit interface, handling transfer speeds up to 8.3 MB per second.

ATA-2 or EIDE (Enhanced IDE). Supports transfer rates of up to 13.3 MB per second.

ATA-3. A minor upgrade to ATA-2 and offers transfer speeds up to 16.6 MB per second.

Ultra-ATA (Ultra-DMA, ATA-33 or DMA-33). Dramatic improvements in speed, with transfer rates up to 33 MB per second.

ATA-66. A version of ATA that doubles transfer rates up to 66 MB per second.

ATA-100. An update to the ATA standard supporting transfer rates of up to 100 MB per second.

ATA-133. Located mainly in systems based on AMD processors (not supported by Intel), with transfer rates up to 133 MB per second.

IDE / EIDE Hard Drives

Serial ATA Hard Drive Units

Ultra DMA 100 Hard Drives

SCSI (Small Computer System Interface)

This is the hard disk interface standard used by many high-end computers, networks and servers and Macintosh computers from Apple, with the exception of the first Macs and new iMacs. While some systems support SCSI controllers on their motherboards, most feature a SCSI controller card. SCSI is generally faster and reliable, and the SCSI interface supports connection to many more drives than IDE. Although SCSI comes in many different standards, many of them are not compatible. Hence, is important to know that your computer supports the drive you are installing. The different SCSI connections are:

SCSI-1. A connection through a connector 25 pin, supporting transfer rates of up to 4 MB per second.

SCSI-2. Use a 50-pin connector and supports multiple devices with a speed of transfer of 4 MB per second.

Wide SCSI. These units have a wider cable and a 68-pin connection that supports 16-bit data transfers.

(20 MB per second).

Ultra SCSI or Ultra Wide SCSI. Use an 8-bit bus and transfers data at 20 MB per second.

SCSI-3. Characteristics of a 16-bit bus and transfers data at 40 MB per second.

Ultra2 SCSI. Use an 8-bit bus and transfer data at a speed of 40 MB per second.

Wide Ultra2 SCSI. Use a 16-bit bus and supports data transfer rates of 80MB per second.

SCSI Hard Drives

Ultra320 SCSI Hard Drives

FireWire (IEEE 1394)

FireWire standard is becoming popular in portable hard drives that can be connected and removed without having to restart the computer. Supports data transfer rates of 50MB per second, which means it is ideal for video, audio and multimedia applications. FireWire card and requires a dedicated unit HDD in use require an external power source, but the interface can support up to 63 devices simultaneously.

FireWire Hard Drives

USB 1.1 (Universal Serial Bus)

Most computers today include USB ports on their motherboards. (The older model, you can install a card). USB drivers can be used to connect external hard drives and can hold up to 127 devices simultaneously either through USB or linked sites in a chain fashion. USB controllers do delivery power to devices connected to them, but many of the hard drives still use an external power source. USB is limited by its data transfer speed, the maximum rate is about 1.5 MB per second.

USB Hard Drives

USB 2.0 (Hi-Speed USB)

A little further and made the best connection standard that offers backward compatibility and data transfer rates of up to 60 MB per second. USB 1.1, the system can use a USB 2.0 device, you have a USB 2.0 controller card to reach the highest transfer rate.

USB 2.0 Disks Hard

Fiber Channel

Fiber cable is used primarily for the network of high bandwidth servers and workstations, provided very fast the data transfer rates (up to 106MB per second), and the cable connection to long distance, but is expensive and you need to install an interface card.

Spin rate

Data transfer rate is crucial to the team that works so well for you. Apart from the connection types above, the performance of your unit hard drive depends on its rotation rate measured in RPM. Higher RPM usually means faster data transfer rate. The lowest speed that is acceptable in computing today is 5400 RPM. The common standard at present is 7200 RPM. Higher speeds, but are available in SCSI drives and the system is an area where technology is in constant development.

Hard Drives 3600 RPM

Hard Drives 4200 RPM

5400 RPM Hard Drives

Hard Drives 7200 RPM

10,000 RPM Hard Drives

15,000 rpm Hard Drives

A higher capacity hard drive does not necessarily make your system work faster unless under the available disk space to your existing drive. But with an Ultra ATA/100 or ATA/133 and a 7200 RPM spin rate will be rather a guarantee of better performance the hard disk.

Other considerations

CACHE

Cache (pronounced 'cash') is additional temporary memory that acts as a buffer between the system and the unit. Often the data are stored in the cache for rapid access. Varying cache sizes of 512 KB to 16 MB in some SCSI drives. The larger cache you have on your drive, the faster the data transfer unit. If you are working with large files such as video, images and audio files, it's worth having the largest cache you can get (8MB or more).

Seek Time

The data is stored on your disk tracks and sectors that deal with your hard disk controller to retrieve some data, you will find. The search time is a measure of how long it takes the hard drive for find a specific track on a disc. Search times may vary slightly from disc to disc and one with a fastest time ever best search results.

FOREIGN AFFAIRS AND TRANSFER OF FEES

These two types of saying how fast a drive actually reads the data and passes along the system. Internal Transfer Rate refers to the time it takes for a drives heads to read data from the source and pass it to the drive cache. The external transfer rate (sometimes called the Transfer Rate or the Burst Transfer Rate) is a measure of the time it takes to send data from the cache all the way to the computer's memory. Naturally, the faster transfer rates provide better performance.

SMART (Self-Monitoring Analysis and Reporting Technology)

This is a nice feature built some hard drives that can help alert you to a possible hardware problem. Your computer's BIOS must support this for the SMART function it to work, however the unit will continue to operate in a system without it.

Purchase and installation of a hard drive has some technical issues that you need to take into account. Myshopping.com.au used to compare different brands and hard drive specifications for the drive that will work best for your needs and your computer. You can compare prices and service offerings from different vendors.

About the Author:

Andrew Gates is a writer for the online comparison shopping service MyShopping.com.au. MyShopping.com.au helps you compare hard units and purchase online top-rated online stores. You can also read the hard drive reviews and specifications.

Article Source: ArticlesBase.com – Title = "Guide to buying Hard Drives"> Guide to Buying Hard Drives

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