Guide to buying an external hard drive

An external hard drive is perfectly fine to make use of if you want to make backups of data in a simple way or if you want to move large amounts of data between computers.
The prices of external hard drives are very diverse. While the simplest models only cost a few hundred pieces, there are advanced models that cost several hundred dollars. Lagringsutrymmets size is of course an important factor in current prices, but also the physical size of disk,cache , rotational speed, and more into play. Generally, 3.5-inch disks cheaper than the 2.5-inch disks .
3.5-inch format is the size most commonly used as internal hard drives in desktop computers are concerned. External hard drives in this format usually have a power adapter. 2.5-inch disks can often be powered directly by the USB cable that you use to connect your hard drive to your computer. There is also this size of hard drives used in laptops. Are you looking for a dish that is quick to connect and want to avoid unnecessary clutter, it is probably a 2.5-inch disk to buy.
Performance
As for the performance of your hard drive you should buy it in addition to the storage size in particular hard drive's rotational speed, seek time and cache size, you'll look closely at.
In the case of the rotational speed is usually the most often be lower in 2-5-inch disks than in the 3.5-inch disks. Avoid drives where the rotational speed is 4500 RPM or lower. The higher the rotational speed you have on your hard drive, the shorter seek time and better performance.
The cache memory on the hard disk is a temporary memory where data is stored in anticipation of your computer to assimilate the information requested. When using a program that is very disk intensive, such as video editing software or music recording, playing cache extra large role. In the current situation, you should have a minimum of 8 MB, preferably 16 MB cache on your drive.
Connection
There are several ways to connect an external hard drive. Firewire , USB and eSATAare the options available and these are ESATA the fastest option. So far, however, relatively few computers that are equipped with an eSATA port and the speed Firewire (800 Mbps) and USB 2 (480Mbps) offers is perfectly adequate for most needs.
In particular PriceSpy and Pricerunner, you can find lots of external hard drives with different specifications of the various different manufacturers.

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