A Gigabyte is now a Gibibyte.

Ever been confused by file size calculations? Gigibyte,etc. has long had two meanings. Computer science people use exponential counting so a gigabyte is 1,024 megebytes. For the rest of us, a gigabyte is 1,000 megabytes. Snow Leopard has changed the way it calculates file sizes to the normal non-computer method. The result? A file that in Leopard was 241.2 MB is now 252.9 MB in Snow Leopard. That 250 GB hard drive that Leopard indicated was 238 GB is now back to 250 GB because the drive manufacturers and Snow Leopard both use the non-computer meaning of the term. Confused? Join the crowd. For Macworld's discussion see http://tinyurl.com/mnwerl.