Stupid iPod Question about HD Sizes.

Ok,
I'm really excited because I'll be getting a 2nd hand ipod 2G 20gig iPod tomorrow, but I'm not sure which problems I should look for in examining it before I buy.

Does anyone have any suggestions? Also, how do you confirm that the hard drive size IS 20gigs?

Thanks, the guy claimed that it runs for 10hours playing nonstop, but I'll definitely take a look at the stuff you just mentioned.

Oh yeah, one last question: This iPod is less than a year old, so if it does break down, does the Apple warranty still apply? Can I still get Applecare for it?