Hello I got an old iMac 17. I am trying to transfer some files but it just won't do it over ethernet due to permissions or stuff that I just can't figure out I tried a lot with it. Now I am getting an external HD for backup. Here is what I noticed most of the external HD got USb 2.0 , but my iMac has the older slower USB. I got firewire, but after asking around I was told to use WD hard-drives, but those got no firewire Its getting confusing My cd-burner died like 4-5 years ago, it won't transfer over ethernet, on USB it is way too slow and problems with permission of transfer. external HD is my last choice by backing it up. is it doable with the slower USB? are there cheaper firewire HD? Because my imac's hard drive is only 80 GIGS. I do not want to buy the 500 GB with firewire just for that.