An external hard disk is a hard drive that connects to a computer from an external port. There are a number of popular interfaces for external drives, including:
Firewire (a favorite interface for Mac users)
Universal Serial Bus or USB. USBs are able to connect a high number of devices, such as MP3s and PDAs in addition to external hard drives.
addition to external hard drives
ESATA is the latest interface for external hard drives. ESATA external drives follow the identical protocol as internal drives, allowing for better performance in the external drive.
Ethernet links. All these are less common, they act like document functions to store your own data.
External drives are relatively inexpensive, letting you take your data with you everywhere you go and access it on just about any computer, due to their portability and ease of use. the best external hard drive come in a vast range of different versions, all with various rates and data storage capacities.
In choosing the proper version for you, you need to be aware of the number of data you want to store, as that will determine the storage size of the drive which you require. Keep in mind your data storage needs will almost certainly grow over time, and also make sure that you buy one that will insure not just your short term but also your long-term needs.
You’ll also need to consider the cache size of this drive. The cache size controls how fast you can store data on the driveway. The bigger the cache, the quicker you can copy files to your own drive. The more complicated the cache size, the more expensive your drive will be, so allow your individual needs and situation determine your buy.
You are able to add more storage as the amount of your data increases. As the dimensions of the drive increases, your device will probably require its own power supply as it will not have the ability to draw sufficient power from the USB or Firewire connection .