DVD "size limit"

Hi folks,
I own a 1.25 Ghz eMac that has done me good service for years. I'm lately experiencing a weird problem with the Superdrive. Although I'm using, not only the same DVD brand, but even the same opened package, of 4.7 gig DVDs, it only recognizes a capacity of 4.28 gigs.
Any suggestions?

What you're seeing is normal. This is caused by a difference in how different entities define a 'GB'. All drive and media manufacturers quote capacity using 1,000 bytes per kilobyte while other entities, particularly in computer operating systems, use 1024 bytes per kilobyte (there's a new term that has been proposed for the 1024 usage to clear up the confusion, but no one uses it).
* 1,000,000,000 = 1,000x1,000x1,000 is used by hard drive and media manufacturers.
* 1,073,741,824 = 1,024x1,024x1,024 is used by the Finder and Apple's utilities.
Doing the math:
4.7 x 1,000,000,000 / 1,073,741,824 = 4.377 'GB'
Including formatting overhead, a DVD-R (or DVD+R) will indeed have an effective capacity of about 4.2 to 4.3 GB. For further information, see Knowledge base article #30065, which applies to any data storage medium.

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