USB Flash drive not working after upgrade.

Its a SanDisk 8GB USB memory stick with the U3 filesystem on it. It works fine on Windows machines and on 10.5, but won't show up as a useable volume in Finder when inserted into my MBP.
Oddly enough, it does show up when I run Parallels - but only in the windows VM. It also shows in Parallels in the list of attached USB devices.
It just won't mount as a volume.
Any ideas?

Hi,
copy anything on your drive to your desktop in parallels then reformat the drive.
There's a good article Here on how to format a drive for Mac and Windows.
Regards

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I had the same issue after installing Mountain Lion from the App store. The issue is you are missing the IOUSBFamily.kext extension amongst others. The solution is to backup your macbook, then perform a clean install of Mountain Lion.
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Hi Neal2014,
Welcome to the HP Forums!
I would like to take a moment and thank you for using the forum, it is a great place to find answers. For you to have the best experience in the HP forum, I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that you recently purchased a HP USB drive. You are now getting a message to format it, but are unable to. Have you tried to format it on a different computer?
If you are unable to format the drive, I suggest you call HP support, as I believe it will still be in warranty.
Please call HP technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. HP Technical Support Sitemap
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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I have the same problem too. (USB was working on windows XP but no longer does but windows 7 is fine. ) I logged a request on the HP website and got an email from [email protected]
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USB Flash drive not working after upgrade.

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