USB flash drive not recognized on desktop or disk utility

I see a number of similar threads to this but nothing solves this problem. Any help will be greatly appreciated as I am about to go crazy!
I have 3 USB thumb drives that all worked 2 days ago - now only one does. I have tried all drives in multiple ports and the same result. I have restarted the iMac (2009 Yosemite) a number of times and the same result.
This came about attempting to create bootable USBs with each of these. I was struggling with the process on my mac so took 2 (brand new 16GB PNYs) to a PC created the live boot USBs and they booted fine on the PC (knowing this wouldn't boot my mac). I did however plug them into my mac and they were recognized. I finally found success creating a Ubuntu live boot with my old USB. With that success I wanted to try with one of the new USBs on the mac.
Here is what I did:
1. Using Disk Utility - Reformatted the drive 1 partition MS Dos FAT 32
2. In Terminal unmounted the drive and ran a dd command to copy the linux .img file successfully
3. Box came up saying drive not recognized and selected to ignore (this happened on my old one that still works also)
4. Ejected drive from terminal
5 Restarted mac and attempted to boot from USB without success.
After this the 2 new USBs were no longer recognized in any usb port while the other still is. They do not show on the desktop nor in Disk Utility. I checked them on the PC and they are still both recognized and showing the FAT 32 format.
Help please!

Thank you for the reply. I found some time to go through this process a number of times without success
Any other suggestions?

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Okay, and in the most ridiculous way I have ever solved a technical problem...
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Hi:
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https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=20019&lang=eng&ProdId=816
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http://h20564.www2.hp.com/hpsc/swd/public/detail?sp4ts.oid=447347&swItemId=ob_47264_1&swEnvOid=2094
Go to the device manager and click to expand the Display Adapters category. Click on the standard vga adapter.
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Wireless assistant. Use the W7 driver from the 6910p
Quick Launch Buttons: Use the W7 driver from the 6910p.
Touchpad: Use the W7 driver from the 6910p.
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Oh, and if you don't like all the Dell stuff showing up on your PC, just download this plain W7 Pro 32 bit SP1 ISO file directly from Microsoft, and use the Dell W7 Pro product key on it.
http://msft.digitalrivercontent.net/win/X17-24280.iso Windows 7 Professional x86 English
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Usb flash drive not mounting when inserted (SOLVED)

Hi,
I am (now) using fvwm-crystal with rox as my file manager and when i insert a usb flash drive in to a usb port nothing happens. I check /media and nothing is there. Yes i do have hal started at boot.
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Last edited by theringmaster (2007-10-09 20:28:42)

Well, there are the on-line manual pages:
man ivman
man IvmConfigActions.xml
man IvmConfigBase.xml
man IvmConfigConditions.xml
man IvmConfigProperties.xml
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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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USB flash drive not recognized on desktop or disk utility

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