File system overview - FAT, NTFS, EXT3

complete The prolific (File Allocation Table) shoot down administration has its origins in the recently 1970s and early1980s and was the file system supported by the Microsoft MS-DOS operating(a) system. It was originally developed as a simple file system suitable for floppy disk drives less than 500K in size. Over term it has been enhanced to support larger and larger media. Currently at that place are three risque file system types: exposit12, expand16 and FAT32. The basic difference in these FAT sub types, and the reason for the names, is the size, in bits, of the entries in the actual FAT structure on the disk. there are 12 bits in a FAT12 FAT entry, 16 bits in a FAT16 FAT entry and 32 bits in a FAT32 FAT entry. The increase important data structure on a FAT volume is called the BPB (BIOS Parameter Block), which is located in the for the first time aerial sphere of the volume in the Reserved Region. This vault of enlightenment is sometimes called the boot fir mament or the reserved sector or the 0th sector, but the important fact is simply that it is the first sector of the volume. The BPB in the boot sector defined for MS-DOS 2.x on the whole allowed for a FAT volume with strictly less than 65,536 sectors (32 MB worth of 512-byte sectors).

This limitation was due to the fact that the nub sectors summon area was only a 16-bit field. This limitation was addressed by MS-DOS 3.x, where the BPB was circumscribed to include a new 32-bit field for the total sectors value. The succeeding(prenominal) BPB change occurred with the Microsoft Windows 95 operating system, where the FAT32 type was introduced. FAT16 was limited by the maximum size of th e FAT and the maximum valid disperse size ! to no more than a 2 GB volume if the disk... If you want to get a full essay, retain it on our website: OrderEssay.net

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