So I built this amazing minecraft creative world on an early MacBook Pro early 2011 with an underwater subway and a completely automatic minecart item transport system that I designed myself, along with an escalator (designed myself) and about 11 other amazing things including a 40x40x20 shopping mall and an underground palace with its own elevator. About a month or so ago, my hard drive failed after about a month or two of not being used at all. The partition map was corrupted (using OSX Mavericks) and repairing the hard drive did not work at all. (Tried everything, I'm not incompetent with a computer)
So there's no hope for my computer. But I did save my minecraft world on a flash drive. However i'm not sure if I saved it correctly. What I did was I just copied, then dragged and dropped the minecraft saves from my User/library/application support/minecraft/saves into a flash drive. (I know, i didn't look more into it and I'm an idiot)
I know that duplicating a world on minecraft will spawn you in a totally different world where none of the stuff you made is anywhere near, or nonexistent, but how about loading off a USB? If by chance I did actually save the world correctly, then how would I get it back into a minecraft game on a new computer?