What is the best brand of back up hard drive for my laptop?

I have a Dell Latitude D610. I wanted to know what the recommended back up hard drive for it would be. I mostly just need to it to store documents, videos, and music files. I'd like to know the suggested brand and gig size best for my laptop. Thanks in advance!
Are the drives mentioned in the following answers compatible only with laptops? Or do they need to be formatted accordingly?

every Western Digital drive i have had has died, both internal and external drive. I have two Maxtor externals and one Simpletech external and all three have been great.

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