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I recently received a USB. It worked fine for a while, then I formatted it using the Format New Disk menu in Windows. Now, it has a lot of unallocated memory. I know this is not a fake USB drive because it worked earlier.

When viewing this in Disk Management, I see this:

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However, I cannot allocate space to the unallocated partitions. When I right-click, this is what I get:

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Additionally, right-clicking the label in the top menu gives this:

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On all other disks (which work), I get something more similar to this:

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Additionally, when viewed in File Explorer it looks different (It's disk E)

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When trying to view it in File Explorer, I get this error:

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Trying to use DIR in command prompt yields the same result:

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How to I allocate the space?

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While you can always allocate the space, sadly, Windows cannot detect more than one partition in a USB Drive marked as Removable Drive. Besides, if you still want to create multiple partitions for any reason, there is a software named EaseUS Partition Master for Windows. Download it, install it, plug your USB drive, open the software and then,

  • Click over EaseUs Partition Master Free icon;
  • It will detect available drives as Disk 1, Disk 2, etc. Identify your USB stick by its size. If only primary HDD and USB Stick is connected, your drive would be Disk 2;
  • Right-Click on any partition of this drive and select Delete/Resize/Format (based on your needs);
  • Click Apply icon right below the General option in Menu Bar - source;
  • You now will only be able to access the first partition you created in second last step - source;

My answer is based on EaseUS Partition Master Free Edition 10.1. Yours may differ.

About EaseUS Partition Master

EaseUS Partition Master Free Edition is a free partition manager software. It offers a powerful range of functions such as resizing, formatting, copying, creating, deleting, hiding partitions and a handful other functions.

Where to download

Here from http://www.easeus.com

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  • I think it's very silly Windows only finds the first one, but your answer solved my problem. Thanks!
    – Jon
    Mar 11, 2015 at 2:30

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