How to use Seagate "Expansion" portable drive for both Windows and Mac
I just recently bought a Seagate "Expansion" portable drive (320GB). I was looking for a simple portable drive with no software involved, just to add/remove files. The requirement said "Windows" but you can actually use it for mac also. Just go to the applications/utilities folder and look for "Disk Utility". Select Erase and format to "MS-DOS (FAT)". After formatting, you can use this for both Windows and Mac. Keep in mind though, to backup the included files with the Seagate drive before formatting it. You might use it later.
(UPDATE Sept 21, 2012: Sometimes movie files reach up to 8GB. FAT file system has a maximum limit of 4GB per file. You get the point, right? This link would give you a way around it - http://allanpanaguiton.s43.eatj.com/roller/rantandcode/entry/why_ex_fat_is_good)