So I'll have to offer one that has both.
Sorry but you may need a Firewire cable but with the lacking model I can't tell.
As to reading the files on the PC, if you use the old FAT32 format then it will work.
I have an older Mac that does not have an Intel processor that I would like an external HD to back up my files. These are basically desktop publishing/graphics files that will later be transferred to a Win 7 computer to be used with the PC Adobe CS for Windows. I am having trouble finding an external that can be used on an older Mac. Suggestions appreciated!