I've been looking for the same thing. Here's what I've come up with: http://www.xpcgear.com/dualbay.html
You could get a USB external hard drive and plug it in
While external hard drives have the availability to work with multiple computers, it would be false to say every external hard drive works with every computer.
Someone can purchase Western Digital External Hard Drives from the Amazon website. The Amazon website has multiple sellers offering the hard drive up for sale.
external hard drives
There are many different brands of external hard drives. Although most people do not think they ever need an external hard drive, it is always good to have one just in case. The most reliable brands of external hard drives are Western Digital and Seagate.
Commonly, external hard drives will acquire power from the computer it is connected to. It is possible, though, to connect external hard drives to an outlet and permanently to the computer, replacing the previous hard drive, though I highly do not recommend such.
Some of the benefits of the Lacie External Hard Drive are that one can take the External Hard Drive to wherever one need it, also that these External Hard Drives are practical and easy to take since they are small.
An external hard drive can only be connected to a router with a USB port. Consider Asus routers for hooking up external drives.
I opened the 500gb external and found a Seagate Barracuda drive to my surprise.
Yes, you can install multiple hard drives in your computer. If you have multiple internal bays then you can install drives inside the case. If not, you can buy external Firewire and USB drives that attach to the ports on the back of your computer. If you are unfamiliar with opening your computer, then choosing an external solution is the easiest and beth method.
Modern disk drive construction more or less requires drives to have at least one partition. Whether the drive is internal or external is immaterial.
It is likely to depend on the speed of the external hard drive, although most newer external hard drives have a reasonable speed, so it is likely you will be fine wi th using an external hard drive.