What is an OS CD (or DVD)?
OS is shorthand for Operating System. When Macs ship new, their drives are loaded with the operating software as well as other programs Apple is giving away at the time, and most of those are provided on a back-up CD or DVD. All of our used Macs come pre-loaded with the OS listed in the description, but we don’t automatically include the back-up media. The only time this might be an issue is if you have a problem whereby you need to reformat the drive. Since most people already have a copy of some sort of Mac OS on hand, that isn’t a problem for them, but, as we mentioned, these discs are available for sale with the used Macs for those who would prefer to have them.
