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  1. #1


    Member Since
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    Partitioning USB drive with one partition still leaves an extra 2GB free. Please Help
    Hi,

    I have an 8GB usb flash drive but when i format it using one partition the partition is only 7.67GB. It says i still have 2.27GB left and the total capacity of my drive is 8.02GB. I have partitioned the drive over and over again and each time i get the same result. How can i get my partition to take a the full capacity of my drive.

    (See attached picture for details.)

    Thanks for any help.

    Dave
    Attached Images Attached Images

  2. #2

    Buzzard2010's Avatar
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    Try formatting in a different format, i.e FAT and see if it gives the same result, if it formats it correctly then format with Mac OS extended again, should clear the problem

    - Simon

    If you have been helped, don't forget to use the Reputation system at the top right of their post.
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  3. #3


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    Quote Originally Posted by Buzzard2010 View Post
    Try formatting in a different format, i.e FAT and see if it gives the same result, if it formats it correctly then format with Mac OS extended again, should clear the problem

    - Simon
    I'ved already formatted in FAT and the result is still the same.

  4. #4

    Buzzard2010's Avatar
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    Sound like the memory module has become damaged, the system sees how big it should be but is only formatting what it can access and blocking the rest off hence only seeing a smaller protion available

    - Simon

    If you have been helped, don't forget to use the Reputation system at the top right of their post.
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  5. #5


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    Quote Originally Posted by Buzzard2010 View Post
    Sound like the memory module has become damaged, the system sees how big it should be but is only formatting what it can access and blocking the rest off hence only seeing a smaller protion available

    - Simon
    Any idea how it can be fixed?

    Thanks for your help.

  6. #6

    chscag's Avatar
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    What I don't understand is why you formatted it to begin with? The drive was pre-formatted from the factory as FAT or FAT-32. Re-formatting flash drives usually spells trouble. Search the forums for the fix. Basically, you have to remove the partitions (clean the drive) first.

  7. #7

    Buzzard2010's Avatar
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    To be honest if its a memory stick / dongle, its not worth trying to unless there is something of real importance on there it'll cost the same if not more than to just buy a new one!

    - Simon

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    May 2011
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  8. #8


    Member Since
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    I bet you are using Disk Utility. My advice is ditch Disk Utility and use GParted instead.

    GParted -- Welcome

  9. #9


    Member Since
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    So pretty much we're saying theres no way to fix the issue. What i also don't understand is why should reformatting mean that i should loose some space on my drive as reformatting should delete everything anyway. Is there anything i can do to avoid this?

  10. #10

    chscag's Avatar
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    Because reformatting a flash drive is almost never necessary. And as I stated above, reformatting usually causes problems - especially when using Disk Utility.

    See the following LINK for a remedy. After cleaning the drive with the procedure I linked you to, you'll need to create a partition on the drive and then format it. Do not use Disk Utility, use Disk Manager from Windows instead.

  11. #11


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    Quote Originally Posted by chscag View Post
    Because reformatting a flash drive is almost never necessary. And as I stated above, reformatting usually causes problems - especially when using Disk Utility.

    See the following LINK for a remedy. After cleaning the drive with the procedure I linked you to, you'll need to create a partition on the drive and then format it. Do not use Disk Utility, use Disk Manager from Windows instead.
    That didn't work earthier. After cleaning the disk in windows it still says it's only 7.46GB, this is even before i've partitioned it, this is just unallocated space. When i partition that is obviously the only space i get.

    So i take it there is not much more i can do. But for future reference what program would you recommend for partitioning disks so i can try and avoid this problem again.

    Thanks for all your help.

  12. #12

    MYmacROX's Avatar
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    Quote Originally Posted by deejay390 View Post
    But for future reference what program would you recommend for partitioning disks so i can try and avoid this problem again.
    If by "disks" you mean USB flash drives, chscag already gave you the answer...

    Quote Originally Posted by chscag View Post
    Do not use Disk Utility, use Disk Manager from Windows instead.
    64GB iPhone 6, 64GB iPad Air 2.

    Reminder: Please include your Mac's specs. This will make it much easier for the other members to assist you.

  13. #13

    dtravis7's Avatar
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    Is this a U3 drive by chance? What brand is it? What version of OSX is on your Mac? If it's not 10.6 an 8GB drive will never show up as 8GB but 7 and some change.

    A U3 drive (Sandisk for one) has U3 partition that no disk utility will ever remove. You have to get a tool from Sandisk to remove it and get the full size of the drive.

  14. #14

    chscag's Avatar
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    I forgot to mention the U3 part, so thanks to dtravis7 for that. He's right, if it's a U3 type, there is no way that Disk Manager can remove it.

    Also, another thing we may be forgetting is that an 8 GB flash drive in reality (real measurement) only has around 7.5 GB of usable space.

  15. #15

    dtravis7's Avatar
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    This is why I was asking if he was running 10.6 or 10.5 or before. 10.6 reports drive size in Base-10 and older OS's including Windows use Base-2.

    So in 10.6 it should show around 8GB.

    Here is my 16GB Sandisk that I removed the U3 partition on using the San Disk utility. In 10.6 it shows up at 16.01 GB but in 10.5 shows 14.91 GB.
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