the way it works: cdimage looks for files with the that exact size and content, then at the time of creating the iso it copies the file just 1 time and the rest of similar files look at the same sector through the toc. that is: if drivers.cab is the same for all w9x setups, it will only be copied 1 time on the cd and everytime drivers.cab is called (from differents w9x setups) it will be referred to the sector the first driver.cab was copied.... dunno if it's clear that's why when you copy all the contents to your HD, i.e. drivers.cab will be copied multiple times to different locations this is a trick named "re-link files" and it is mostly used at the time of ripping console backups