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  1. Senior Member
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    #1

    Default *TechNote*: Hard disks #1 - Sectors, Clusters, Fat

    A sector is always 512 bytes, which is half a kilobyte.

    A cluster (also known as allocation units) is the smallest unit of disk that the operating system knows how to handle when writing files and is made up of a number of sectors.

    Logical formatting creates a file allocation table (FAT) and defines the minimum number of sectors a cluster can use to store data.
    The number of clusters is dictated by the format. FAT16 has 65,525 and FAT32 has a maximum of 268,435,456. They typically vary in size between 2k and 32k, depending on the size of the volume.
    The FAT is a record of which files are contained in which clusters. For instance, if a file is 32k in size it will take up 8 clusters, if the clusters are 4k in size. Regular defragging of a drive ensures that these clusters are continuous.

    The more sectors a cluster has, the lesser the demands are on the FAT.

    Partition size....Recommended file system / cluster size
    1-16M..............FAT-12 / 4K
    16-256M..........FAT-16 / 4K
    256-512M........FAT-16 / 8K
    512M-1G..........FAT-16 / 16K or FAT-32 / 4K
    1-8G...............FAT-32 / 4K
    8G and up........FAT-32 / 8K
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  3. Junior Member
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    #2

    Default Phat - FAT

    Is that a typo? you state:
    Partition size....Recommended file system / cluster size
    1-16M..............FAT-12 / 4K
    16-256M..........FAT-16 / 4K
    256-512M........FAT-16 / 8K
    512M-1G..........FAT-16 / 16K or FAT-32 / 4K
    1-8G...............FAT-32 / 4K
    8G and up........FAT-32 / 8K

    AND you state 1-16M....Fat-12 / 4K. Well, my questions is FAT-12? Ive never head of FAT 12. Is this a Typo or am I just clueless?
    ~JakL~
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  4. Senior Member
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    #3
    FAT12 is the file system that a floppy disk uses.

    Cheeblie
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  5. Senior Member
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    #4
    cheeblie is right
    and CD use the cdfs file system.
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  6. Junior Member
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    #5
    Can i convert my HDD parition into FAT-12 ? ? ?

    Or can i convert any floppy disk into FAT-16 or FAT-32 ? ? ?
    through any software or technique......

    Bye 4 nao !
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  7. Ancient Relic.......
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    #6
    Quote Originally Posted by Munda
    Can i convert my HDD parition into FAT-12 ? ? ?

    Or can i convert any floppy disk into FAT-16 or FAT-32 ? ? ?
    through any software or technique......

    Bye 4 nao !
    A floppy will always use Fat12, and can not be converted. A HDD partition would use Fat16, Fat32, or NTFS.
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  8. Junior Member
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    #7
    Quote Originally Posted by Ricka182

    A floppy will always use Fat12, and can not be converted. A HDD partition would use Fat16, Fat32, or NTFS.
    Thanx alot
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  9. Member
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    #8

    Default Re: *TechNote*: Hard disks #1 - Sectors, Clusters, Fat

    Quote Originally Posted by bellboy
    A sector is always 512 bytes, which is half a kilobyte.


    Partition size....Recommended file system / cluster size
    1-16M..............FAT-12 / 4K
    16-256M..........FAT-16 / 4K
    256-512M........FAT-16 / 8K
    512M-1G..........FAT-16 / 16K or FAT-32 / 4K
    1-8G...............FAT-32 / 4K
    8G and up........FAT-32 / 8K
    Do I need to know this for the exam???
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  10. Alligator wrestler Moderator Plantwiz's Avatar
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    #9
    Not only will it benefit you to know if for the exam, it will help you in the field.

    Understand it and be familiar with it - I wouldn't spend a week on it, but yes, you should know it.
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  11. Junior Member
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    #10
    HPFS - NT 3.51
    NTFS4 - NT 4
    NTFS5 - 2000 and XP
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  12. Member
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    #11
    Quote Originally Posted by coyote911
    HPFS - NT 3.51
    NTFS4 - NT 4
    NTFS5 - 2000 and XP
    HPFS is OS/2: http://www.lesbell.com.au/hpfsfaq.html
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  13. Junior Member
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    #12

    Default Re: *TechNote*: Hard disks #1 - Sectors, Clusters, Fat

    Quote Originally Posted by bellboy
    A sector is always 512 bytes, which is half a kilobyte.

    A cluster (also known as allocation units) is the smallest unit of disk that the operating system knows how to handle when writing files and is made up of a number of sectors.

    Logical formatting creates a file allocation table (FAT) and defines the minimum number of sectors a cluster can use to store data.
    The number of clusters is dictated by the format. FAT16 has 65,525 and FAT32 has a maximum of 268,435,456. They typically vary in size between 2k and 32k, depending on the size of the volume.
    The FAT is a record of which files are contained in which clusters. For instance, if a file is 32k in size it will take up 8 clusters, if the clusters are 4k in size. Regular defragging of a drive ensures that these clusters are continuous.

    The more sectors a cluster has, the lesser the demands are on the FAT.

    Partition size....Recommended file system / cluster size
    1-16M..............FAT-12 / 4K
    16-256M..........FAT-16 / 4K
    256-512M........FAT-16 / 8K
    512M-1G..........FAT-16 / 16K or FAT-32 / 4K
    1-8G...............FAT-32 / 4K
    8G and up........FAT-32 / 8K
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  14. Junior Member
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    #13

    Default Re: *TechNote*: Hard disks #1 - Sectors, Clusters, Fat

    Quote Originally Posted by bellboy
    Partition size....Recommended file system / cluster size
    1-16M..............FAT-12 / 4K
    16-256M..........FAT-16 / 4K
    256-512M........FAT-16 / 8K
    512M-1G..........FAT-16 / 16K or FAT-32 / 4K
    1-8G...............FAT-32 / 4K
    8G and up........FAT-32 / 8K
    Question on this. Now you partition before you format right? So do these apply to the partition sizes or the physical HDD?

    Say I had a 24 gig drive. And formated fat 32 on the whole thing, I would end up with 8k clusters. But if I made 4 6 gig parts would it then be 4k clusters?

    And what is ntfs5 s cluster sizes?
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