When you connect an external hard drive or
external CD-RW drive to a computer , you may need load some software drivers
come together with the drive at first time (only required one time installation
) , after software installation, the computer will assign a drive letter to the
drive, for example, "E" drive, then, this external drive will function
exactly same as an internal drive. For example, if this is an external hard
drive, you can copy files from your any other drives, for example, "C" drive to
this "E" drive; you can install program to this "E" drive; you can run program
from this "E" drive ; If this is an external CD-RW drive, then you can read and
write to CD disk in the drive, and so on
Why considering an external drive
Adds disk capacity to your desktop or laptop computer without removing your
For those laptops and desktop computers that cannot be upgraded internally,
an external drive provides an excellent source of additional storage space.
Data Security: backup your computers internal hard drive to the external
hard drive. Put the external hard drive in a secured place. If you lost your
computer, you still have the most valuable part of the computer: your data. and
also you can restore much faster from an external hard drive than a tape.
Being portable. If you know your destination will have a computer available
with same connection ports, instead of carrying a complete laptop, just carry
the drive with all your applications. Connect it to a computer at your
destination and start working. Less weight to carry.
Which type external drive to choose
table compares the data transfer rate for different connections.
some popular external ports:
Raw bandwidth (Mbit/s)
Transfer speed (MB/s)
5 V, 2.5 W
(15 with port multiplier)
12–25 V, 15 W
12–25 V, 15 W
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