Operating_systems-page55

Operating_systems-page55 - Jelena Mamenko Operating Systems...

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Jelena Mamčenko Operating Systems Lecture Notes on Operating Systems 55 Boot Sector The Boot Sector is of the following format: Byte Offset Length (bytes) Description 0x00 3 Jump instruction (to skip over header on boot) 0x03 8 OEM Name (padded with spaces). MS-DOS checks this field to determine which other parts of the boot record can be relied on [6] [7]. Common values are IBM 3.3 (with two spaces between the "IBM" and the "3.3") and MSDOS5.0 . 0x0b 2 Bytes per sector. The BIOS Parameter Block starts here. 0x0d 1 Sectors per cluster 0x0e 2 Reserved sector count (including boot sector) 0x10 1 Number of file allocation tables 0x11 2 Maximum number of root directory entries 0x13 2 Total sectors (if zero, use 4 byte value at offset 0x20) 0x15 1 Media descriptor 0xF8 Single sided, 80 tracks per side, 9 sectors per track 0xF9 Double sided, 80 tracks per side, 9 sectors per track 0xFA Single sided, 80 tracks per side, 8 sectors per track 0xFB Double sided, 80 tracks per side, 8 sectors per track
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