Jelena Mamčenko Operating Systems Lecture Notes on Operating Systems 47 1 sector The number of sectors depends on disk structure The number of sectors depends on disk structure The number of sectors depends on disk structure Others rest files Fig. 5. MS-DOS disk structure 1. Boot record has special program for checking is disk system or not. Checking criterion is very simple: first two files in a root directory must be IO.SYS and MSDOS.SYS. These two files must be in a root directory exactly disposed in this order. If disk is system boot record every time is disposed in first sector of zero track of zero cylinder. After physical disk sector destruction is no more in use. One physical disk division into independent logical parts for fixed disks is called section. On of the section is used for MS-DOS booting. This is an active section. Information about executed disk division is placed in special called Partition table . This is a part of
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