When Disk Utility reports to you, it reports in base 2, with each k=1024 bytes and M=1024k. When you read a disk manufacturer's literature, however, they will tell you that 1GB=1,000,000,000 bytes. So your raw 60GB disks starts out about 57GB in computer terms. Apple uses the claimed capacity from the the disk manufacturer, so the 10 GB disk is 10,000,000,000 bytes. Apple does note this in the fine print; at the bottom of my Quicksilver brochure one of the footnotes says "1GB = 1 billion bytes, actual formatted capacity less". Mel On Saturday, June 7, 2003, at 11:57 AM, Doug McNutt wrote: > > And to make it all back on topic. When Apple says your G4 disk is 10 > GB does it mean 20 base 10 times 2 to the 30th power - 10,737,418,240 > bytes - or does it mean 10,000,000,000 bytes? What about the disk > salesman? > > <http://physics.nist.gov/cgi-bin/cuu/Info/Units/binary.html> for a > definition of kibi, >