USB Flash Drive Issue On iMac - 1.1 on iMac, 2.0 on any other Mac

I have a Core i7 27" Late 2009 iMac.
I just noticed this issue today.
I have a couple of Patriot XPorter XT USB Flash drives that I use among my Macs to transfer big files around.
Hooking one of the 8GB flash drives to my iMac, the one listed above, it shows the device operating at USB 1.1 speeds, whether it's in a powered hub, or one of the 4 USB ports in the back of the machine. This was odd, because this was the first time it had ever done this. I only noticed this due to the painfully slow transfer rate the Finder was reporting to me. Restarting the iMac, cold starting the iMac, resetting permissions, PRAM and SMC did nothing. I thought it was a bum drive.
So I grabbed a 16GB flash drive (same brand and model family, different capacity) and it works perfectly fine on the iMac at USB 2.0 speeds. Hmm...
So I boot the iMac into Win 7 Ultimate x64. Both drives are listed at USB 2.0 speeds. Something is definitely afoot here.
To make sure I'm not losing my sanity, I grab my MacBook Pro and test the drives in there. Both drives are listed at USB 2.0 speeds.
I then run to my Mac Pro. Both drives are listed at USB 2.0 speeds.
Did something go wonky on my iMac?
Machine specs (for comparison above)
iMac 27" i7 2.8GHz - 16GB RAM
MacBook Pro 15" Core 2 Duo 2.4GHz - 4GB RAM
Mac Pro Xeon 2.66GHz - 12GB RAM

I think that you are just running into a communication blip between the thumb drive and the controller for the USB ports on your iMac. It is obviously reading the 8 GB drive as older and slower and is assigning that lessor priority to the bus serving the drive.
Have you tried attaching the drive directly to the iMac with no other device connected to a USB port? If it is the same, then I doubt there is anything that you can do, that is going to be the way the USB controller reads this thumb drive.

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Looks like some high quality brand
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Last edited by hokasch (2010-05-10 17:51:36)

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USB Flash Drive Issue On iMac - 1.1 on iMac, 2.0 on any other Mac

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