It's just a math issue.
All DVD's have the following storage capacity (well there is tiny difference between +R and -R but nothing worth mentioning):
4.38 GB = 4,485 MB = 4,592,762 KB = 4,702,989,189 Bytes
1KB = 1024Bytes
1MB = 1024KB
1GB = 1024MB
For silly marketing reasons the DVD media industry likes to refer to discs as 4.7GB. When they are doing this they are using mulitples of 1000 instead of the proper 1024.
i.e. They are refering to:
4,702,989,189 Bytes / 1,000,000,000 <-1000x1000x1000
when they should be refering to:
4,702,989,189 Bytes / 1,073,741,824 <-1024x1024x1024
So when they, or anyone, or anything else says 4.7GB they are wrong. It's 4.38GB (again approx).
Wow my head hurts after doing all that math! :bigsmile: