Can I use Time Machine on an external drive that has files already on it.

Please excuse the silly question. New to mac, from PC.
I have a 200g external hard drive that has my itunes library, photos and other assorted files on it.
If I use time machine on this drive will it delete everything that is there, or can I use it in conjunction with the other files that are there?

You can use a Time Machine drive to save other files on it but I think time machine formats the drive when you first activate it so you will have to temporarily move your files while that happens. You best bet would be to partition the drive into a time machine portion and another for your files.
Steve

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