Plugging in an external hard disk is the fastest, simplest way to increase your hard disk space. While you can’t use it as the primary hard disk to which you install Windows Vista, it can provide lots of extra disk space as a secondary drive, for files and programs that require huge amounts of disk space. Typically, an external hard disk can easily be installed simply by plugging it into a USB port (or into a Firewire) and then into a power source. It may also come with software that needs to be installed.
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Typically, a desktop PC has room in its case for two hard disk drives, while a laptop usually only has room for one. You may boost your hard disk space by installing a second hard drive into the second bay to serve as a secondary data drive.