Kamis, 15 Maret 2012

Struktur FileSystem

FAT16 is not recommended for valumes larger than 511 MB, when relatively small file are placed on FAT16 volume, FAT16 manages disk space inefficiently.you cannot use FAT16 on valumes larger than 4 gigabytes(GB)
some operating system in support is:
MS-DOSWindows 95/98/NT/2000/XPWindows Server 2003and some UNIXoperating systems support.FAT16 usually also used for multimedia tool

FAT32: the enhanced version of the FAT system implemented beginning with Windows 95 OSR2, Windows 98, and Windows Me. Features include:

  • Drives of up to 2 terabytes are supported (Windows 2000 only supports up to 32 gigabytes)
  • Since FAT32 uses smaller clusters (of 4 kilobytes each), it uses hard drive space more efficiently. This is a 10 to 15 percent improvement over FAT or FAT16.
  • The limitations of FAT or FAT 16 on the number of root folder entries have been eliminated. In FAT32, the root folder is an ordinary cluster chain, and can be located anywhere on the drive.
  • File allocation mirroring can be disabled in FAT32. This allows a different copy of the file allocation table then the default to be active.

NTFS :a high-performance and self-healing file system proprietary to Windows XP Vista 2003 2000 NT & Windows 7, which supports file-level security, compression and auditing. It also supports large volumes and powerful storage solution such as RAID.

EXT2 is a file system for the Linux kernel. It was initially designed as a replacement for the extended file system. It is fast enough that it is used as the benchmarking standard. Its main drawback is that it is not a journaling file system.

EXT3 is a journaling extension to the standard ext2 filesystem on Linux. Journaling results in massively reduced time spent recovering a filesystem after a crash, and is therefore in high demand in environments where high availability is important, not only to improve recovery times on single machines but also to allow a crashed machine's filesystem to be recovered on another machine when we have a cluster of nodes with a shared disk.
EXT3 does not support the process of checking the file systemeven when thesystem is not cleaned experienced a "shutdown", except in some very rarehardware errors.

Things like this happen because the data is written or stored into a disk in a wayso that the file system is always consistent.

The time required to recover an ext3 file system after the system is not cleaned offis independent of the size of the file system or file number, but depends on thesize of the "journal" used to maintain consistency. Journal of the size of the initial(default) takes about 1 second to recover (depending on the speed of hardware).

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