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Multiple DOS Levels Per Fixed Disk

IP.com Disclosure Number: IPCOM000039754D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01

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Related People

Dachowski, RP May, DS Rourke, DJ [+details]


In the past, only ONE level of DOS per fixed disk was possible. This restriction forced the DOS customer to allocate his ENTIRE fixed disk to ONE level of DOS. A method is described which allows the user to partition his fixed disk into a maximum of FOUR bootable DOS partitions. In the past, it was possible to allocate the storage of a fixed disk on an IBM personal computer (PC) system into 4 distinct, logical partitions. Although 4 partitions could be defined, ONLY 1 partition could be formatted as a DOS partition. As a result, there was no way to create a fixed disk with more than 1 bootable DOS level on it. This restriction forced the user to completely reformat his fixed disk if he desired to install the new level of DOS on it.