700 MB Disc Reads as 670MB

[OrangeJTM46]

Hi

I'm trying to backup some files on to cd, but when I put my 700MB CDR in, it says its actual capacity is only 670MB. Why is this and how can I get the full 700MB? Thanks.

Jon

 

[yellow]

http://forums.macosxhints.com/showthread.php?t=27062&700mb+cd

 

[G5orbust]

Thats called formatting... you have the same deal with hard drives or really any other optical media. A 60GB hard drive actually has about 56-57GB of usable space due to formatting.

 

[zv470]

because 1 megabyte isn't a 1000 kilobytes

1 megabyte = 1024 kilobytes

so 700MB becomes 683MB of real storage
(to get 683MB divide 700,000 by 1024)