On Aug 25, 2004, at 12:36 pm, David M <[EMAIL PROTECTED]> writes:
When I buy a blank DVD-RW it is marked as having a 4.7 GB capacity, but when I put it in the computer, the finder say it's capacity is 4.28 GB. why the descrepency?
Most drive and media manufacturers use the International Standards (SI) prefix which defines giga as 10^9 (1000000000) whereas most computer manufacturers, such as Apple, use a nonstandard definition of giga as 2^30 (1073741824). This adds or subtracts about 7% of the capacity, depending upon whose definition you're using. In 1999, the IEC adopted new base-2 terms including kibi, mebi, and gibi. So what most s/w companies referred to as a gigabyte (GB) should now properly be called a gibibyte (GiB).
Are there invisible files on the disk I'm not aware of? Is this also the case with a DVD-R?
There's some of that, too. But the bulk of the "missing" space is due to the above.
Thanks, in advance. I'm not new to the Macintosh world but I am new to OSX and DVD drives.
It's a problem in most OSs, unfortunately.
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