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Computer Evidence: Collection and Preservation, Second Edition by Christopher L. T. Brown

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Logical Disk Addressing and Access

The logical addressing of data blocks on a hard disk is the method by which the computer system accesses specific data on a hard disk. Two methods of logical addressing used in IBM personal computers are cylinder-head-sector (CHS) and logical block addressing (LBA). CHS was originally designed to address data on a floppy disk and worked quite well referencing the physical location of data. Personal computer BIOS interfaces as well as disk controller interfaces presented limitations on the maximum size of a disk that could be addressed using the CHS addressing method. These limitations brought about the creation of LBA mode, although most of today’s ATA drives still power up in CHS mode. LBA mode eliminates lower ...

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