System for multiple access hard disk partitioning

Details System for multiple access hard disk partitioning System for multiple access hard disk partitioning

1990-10-17

1992-08-04

Heckler, Thomas M.

Boots, shoes, and leggings

364DIG1, 3642802, 3642809, G06F 906

Patent

active

051367114

ABSTRACT:
A system for integrating incompatible hard disk partitioning systems in a single hard disk drive provides a method for installing and operating multiple incompatible absolute zero sector operating systems on the same hard disk drive with a first operating system and its associated boot loader located at absolute physical sector zero and a second operating system and its associated boot loader located at an absolute physical sector other than zero. The system includes a second BIOS that automatically offsets physical addresses for disk requests from the second operating system so that correct absolute physical address of the disk is accessed. This facilitates the use of a single hard disk drive in dual-compatible computers which functions selectively in an IBM AT compatible mode and a non-IBM AT compatible mode.

REFERENCES:
patent: 4779187 (1988-10-01), Letwin
patent: 4928237 (1990-05-01), Bealkowski et al.
patent: 4982324 (1991-01-01), McConaughy et al.
patent: 4984149 (1991-01-01), Iwashita et al.

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