Actual Size of a DVD

A month ago, was tryin to burn a DVD to its maximum extent. Had a Sony DVD which claims its capacity to be 4.7GB. But when I tried burning data worth 4.7GB it said, please insert a disk with 4.7GB of capacity.

I kept on reducing it by 100 MB i.e., 4.6GB, 4.5GB but in vain.even 4.4 GB didnt work. Also, it was giving me confused error messages about DVD+R and DVD-R formats.

After a bit of googling, I found that the 4.7 GB of a DVD disk is actually 4.7 * 10^30. That boils down to 4.3 * 2^30 i.e., 4.3 GiB. When i reduced it to 4.3GB, everything went well. Just thought of sharing this info so that you don't face it further. =)