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  • Sk8erPeter

    nagyúr

    válasz Sk8erPeter #10061 üzenetére

    MS-nél ennyit találtam ezzel kapcsolatban:

    The Default Cluster Size for the NTFS and FAT File Systems

    "All file systems that Windows XP uses to organize the hard disk are based on cluster (allocation unit) size, which represents the smallest amount of disk space that can be allocated to hold a file. The smaller the cluster size, the more efficiently your disk stores information.

    If you do not specify a cluster size for formatting, Windows XP Disk Management bases the cluster size on the size of the volume. Windows XP uses default values if you format a volume as NTFS by either of the following methods: By using the format command from the command line without specifying a cluster size.
    By formatting a volume in Disk Management without changing the Allocation Unit Size from Default in the Format dialog box.
    By using the format command from the command line without specifying a cluster size.
    By formatting a volume in Disk Management without changing the Allocation Unit Size from Default in the Format dialog box.
    The following table shows the default values that Windows XP uses for NTFS formatting.

    Drive size
    (logical volume) Cluster size Sectors
    ----------------------------------------------------------------------------------
    512 MB or less 512 bytes 1
    513 MB - 1,024 MB (1 GB) 1,024 bytes (1 KB) 2
    1,025 MB - 2,048 MB (2 GB) 2,048 bytes (2 KB) 4
    2,049 MB and larger 4,096 bytes (4 KB) 8

    Drive size
    (logical volume) Cluster size Sectors
    -------------------------------------------------------------------------------
    512 MB or less 512 bytes 1
    513 MB - 1,024 MB (1 GB) 1,024 bytes (1 KB) 2
    1,025 MB - 2,048 MB (2 GB) 2,048 bytes (2 KB) 4
    2,049 MB and larger 4,096 bytes (4 KB) 8

    The maximum default cluster size under Windows XP is 4 kilobytes (KB) because NTFS file compression is not possible on drives with a larger allocation size. The Format utility never uses clusters that are larger than 4 KB unless you specifically override that default either by using the /A: option for command-line formatting or by specifying a larger cluster size in the Format dialog box in Disk Management."

    A félkövérített mondat számomra homályos: "The smaller the cluster size, the more efficiently your disk stores information" Minél kisebb a foglalási egység mérete, a lemez annál hatékonyabban tárol információkat.
    De a táblázatban látható, hogy minél nagyobb a logikai egység mérete, arányosan annál nagyobb lesz a cluster méret is - most ebből az következne, hogy minél nagyobb egy partíció, annál kevésbé hatékony a fájltárolás módja.

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