As misleading as it is, hard drive manufacturers usually use rounded numbers for hard drive capacities.
1000 bytes = 1 MB instead of 1024 bytes = 1 MB
1000 MB = 1 GB instead of 1024 MB = 1 GB
So, that hard drive is probably 60000000 bytes (57.22 GB), instead of 62914560 bytes (60 GB). As far as where the rest of that space went, that may have went to partition information, or there may be a small hidden partition on the drive, or something else along those lines. It is normal, unfortunately.
Edit: Yeah, I totally forgot about Kilobytes in there, didn't I?

That's probably where the rest of that space went.
