A computer running Microsoft DOS and Windows can support up to 24 drive letters or partitions, or A-Z with A and B being assigned to your floppy disk drives.

When creating partitions using Microsoft fdisk, the computer is only capable of having one primary partition per hard drive. All other partitions will be extended partitions.

  • See our partition definition for further information and related links.
  • Hard drive help and support.
  • MS-DOS and Windows command line help and support.