I just got a 3 TB external hard drive (I didn't look closely enough and ended up buying one for Mac but I run Windows 7) and it came with a bunch of software I don't particularly want. I want to format it just for storage, though I'd like it to be encrypted. I've found some guides but I'm afraid to do it because I don't really know what I'm doing. There's a 200 MB partition labeled EFI System Partition, a primary partition, and 128 MB of unallocated space.
So my noob questions: What's the purpose of the unallocated space? Can I get rid of the EFI system partition? How can I make as much space available as possible?