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

  1.    18 Jan 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
    Click image for larger version. 

Name:	Screenshot (1).png 
Views:	25 
Size:	13.1 KB 
ID:	117653
    I hope you guys can explain and help me decide which one should i choose. And sorry if this off topic. Thanks in advance.
      My System SpecsSystem Spec


  2. Posts : 2,939
    Win10 Home and Pro, Win10 Insider Preview, Win7 Home, Linux Mint
       19 Jan 2017 #2

    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.
      My System SpecsSystem Spec

  3.    19 Jan 2017 #3

    Otongsitolo said: View Post
    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.
    The default "Allocation unit size" setting is automatically detected, so do not change the setting.
      My System SpecsSystem Spec

  4. topgundcp's Avatar
    Posts : 2,025
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       19 Jan 2017 #4

    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.
      My System SpecsSystem Spec

  5.    19 Jan 2017 #5

    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--
      My System SpecsSystem Spec


 

Related Threads
now im a computer tec and i know that memory cards and hdd are sold as "base 10" like 1gb=1000mb to them instead of 1024mb but im revisiting this question because i was looking into this for some time now and there are some people claiming thats its...
I went to SSDs on all of my computers some time back, but I still use WD RE4s and 2.5 inch WD Black HDDs for a variety of backup tasks and for storage in which the data will not be accessed for a period longer than is ideal to use a non-powered SSD...
Hi, I've had win10 about 2 months now and mail app wouldn't work and weather app stopped after the first day, this week Photo app stopped and usb 3 port locked up and some games graphics were slow. I made a recovery drive on a flash drive and...
Why a 32GB USB Drive for Recovery? in Performance & Maintenance
I have upgraded a Win 7 and a Win 8 computers to Win 10. On the Win 7 I used an 8 GB USB Drive for Recovery and it did not use all of the space. On the Win 8 computer I'm getting a message that I need a 32 GB drive. I understand that it may also be...
I've read that the Windows 10 upgrade process can take up to 32GB, so I'm wondering if it is going to be possible on my netboook. This currently has Windows 7 Starter Edition installed on the 32GB SSD. Is there anything I can do to ease the...
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 06:12.
Find Us
Twitter Facebook Google+ Ten Forums iOS App Ten Forums Android App



Windows 10 Forums