Right. so, I felt comfortable going by a tried-and-true amount, such as 4.25GB as that has worked for me scores of times. In fact, when 4.11GB was deemed "too large," putting that very same data into a 4.25GB disc image, then burning, DID work. not the first time I've seen a Mac have serious "math" problems when it comes to knowing how much space is required for a set of files. nk On Wed, 18 Jan 2006 13:23:14 -0600, Rod Buchanan wrote: > You're correct. Out of curiosity I checked Verbatim's web site: > > "1MB = 1,000,000 bytes 1GB = 1,000,000,000 bytes > Some of the capacity is used for formatting and other functions, and thus is > not available for data storage. As a result, your operating system may > report fewer megabytes/gigabytes." > > -- > Rod