Can't install OSX 10.8 on USB

I have a lab full of Macs I need to install 10.8 on and I have decided to do it with a USB Drive. Whenever I try to install the image onto the drive I get the message: An error (60) occured while copying. (Operation timed out.)
I am using a 32Gb Kingston USB Thumb drive.
I did select the GUID option.
Any ideas?
Thanks

Try this free program - it will erase the drive.
Bootable Drive DVD or USB Flash Drive – Lion Diskmaker

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Verify your computer can run Mountain Lion:
Upgrading to Mountain Lion
To upgrade to Mountain Lion you must have Snow Leopard 10.6.8 or Lion installed. Purchase and download Mountain Lion from the App Store. Sign in using your Apple ID. Mountain Lion is $19.99 plus tax. The file is quite large, over 4 GBs, so allow some time to download. It would be preferable to use Ethernet because it is nearly four times faster than wireless.
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[email protected]

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Can't install OSX 10.8 on USB

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