Windows 10: Allocation unit size for USB flash drive 32GB

Discus and support Allocation unit size for USB flash drive 32GB in Windows 10 Drivers and Hardware to solve the problem; I just bought 32GB usb flash drive and i want to format it, but i dont know what default Allocation unit size for formating it and also i've no idea... Discussion in 'Windows 10 Drivers and Hardware' started by mikelferdinan, Jan 18, 2017.

  1. Allocation unit size for USB flash drive 32GB


    I just bought 32GB usb flash drive and i want to format it, but i dont know what default Allocation unit size for formating it and also i've no idea what it means.
    Here a screenshot

    Allocation unit size for USB flash drive 32GB [​IMG]

    I hope you guys can explain and help me decide which one should i choose. And sorry if this off topic. Thanks in advance.

    :)
     
    mikelferdinan, Jan 18, 2017
    #1
  2. garym123 Win User

    NTFS support for Micro sd card

    Cards 32GB and smaller should be formatted to FAT32 and allocation unit size 32kB.

    Cards larger that 32GB should be formatted to exFAT and allocation unit size 128kB.

    Format on the PC. Do not add date. Put it directly in phone. Add data with phone connected to PC
     
    garym123, Jan 18, 2017
    #2
  3. garym123 Win User
    Best File system type and Allocation unit size for MicroSD card

    For SD cards that are 32GB and smaller, select the file system FAT32 and allocation unit size 32 kilobytes. For 64GB cards and larger select the file system exFAT and allocation unit size 128kB.
     
    garym123, Jan 18, 2017
    #3
  4. Berton Win User

    Allocation unit size for USB flash drive 32GB

    The allocation size I'd use is 64KB. FAT32 formatting can't work with a file size of 4GB + 1Byte or larger, has to be NTFS. I haven't played with exFAT yet. Windows can't format more than 32GB as FAT32. When needing FAT32 I usually format 64GB and larger drives using Linux Mint or the bootable GPARTED LiveCD, have done 125GB and 250GB HDDs as FAT32 to use with my MacBook Pro as Mac OS X and the newer osMAC has problems with NTFS unless using a third-party software.
     
    Berton, Jan 18, 2017
    #4
  5. Avocado Win User
    The default "Allocation unit size" setting is automatically detected, so do not change the setting.
     
    Avocado, Jan 18, 2017
    #5
  6. topgundcp Win User
    Basically, the allocation unit size is the block size on your hard drive when it formats NTFS (default 4096 bytes). If you have lots of small files, then it’s a good idea to keep the allocation size small so your harddrive space won’t be wasted. If you have lots of large files, keeping it higher will increase the system performance by having less blocks to seek.
    For example:
    with a 1 byte file size will occupy 4096 bytes if allocation unit is set to 4096 bytes while it will occupy 8192 bytes if you set it to 8182 bytes.

    For flash drive. You can either format with NTFS or ExFat. However, NTFS on flash memory has been known to be inefficient. exFAT’s smaller footprint/overhead.
     
    topgundcp, Jan 18, 2017
    #6
  7. EdTittel Win User
    One more thing: If you want a UFD to be bootable and your system uses UEFI, you MUST use FAT32 for it to be recognized. And if it ain't recognized, it ain't gonna work, either...
    HTH,
    --Ed--
     
    EdTittel, Apr 5, 2018
    #7
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Allocation unit size for USB flash drive 32GB

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