A computer and a method for preventing access to a hard�disc in a computer on booting-up from a floppy disc

摘要

A method for preventing access to a C drive hard disc in an IBM compatible PC when the PC has been booted-up from a floopy disc comprises transferring the partition code and partition table from the standard partition sector (1) to an alternative partition sector (3) on the hard disc, and encrypting the partition code and table in the alternative partition sector (3). The BPB data and the boot code are encrypted and transferred from the standard boot sector (2) to an alternative boot sector (4) on the hard disc. The standard boot sector is left blank, and an executable protection code is written in the standard partition sector (1). The protection code is read only by the basic operating system of the PC prior to booting-up from the hard disc. The protection code contains an instruction for inserting a protection handler of the protection code in the BIOS interrupt chain as a handler for interrupts for access to the standard partition and boot sectors (1) and (2), and in instruction for directing all valid interrupts for access to the standard partition and boot sectors (1) and (2) to the alternative partition and boot sectors (3) and (4).