i use an external HDD drive.
its a Western Digital 250GB
bought from amazon
click here for only £94.99 (well i'm entitled to tax free, so it was a little cheaper
)
anyway its a lot cheaper than many on ebay!
plus its plug and play one! NO installing of any software or fiddeling with drive letters, formatting etc.
simply plugs into your usb port and thats it!
they are a very good idea, i have hundreds of full length movies on it and haven't even used half the space up
Plus if you get one of the many viruses that seem to be wiggeling their way round p2p, you dont lose all your mp3's, avi's when you have to reformat your computers HDD.