External harddrive reads on only 1 USB

Hey everyone, i have recently taken harddrive out of ps3 and formated as i have done before. I have it in external case and all that. Anyways, the harddrive now reads and writes fine on the USB on the right side of my mac, but not the USB on the left side..? Yet my other harddrive works on both, so it cant be the usb drive. any suggestions?
Thanks

The USB specification calls for all powered USB ports to be able to supply at 500mA. I know that some 2.5" USB HDD cages have a goofy (and non-compliant, IIRC) cable with the computer side having two USBA connectors; one for power and data and another for additional power.
I had my MBP (3,1) in for service to repair an optical drive that wasn't burning. I had them look at the USB ports for the same issue as the OP. Left port will power USB keychain drives and mice (and other low-power devices) but not SSD or portable HDD drives. Right port is fine, works with everything. Both ports worked fine for a while.
They claimed that they couldn't reproduce the problem but explained that the earlier MBP (3,1 and newer, maybe?) had this "feature" and it was related to the fact that one of the ports will still provide power in sleep mode. I have no idea how that works out logically but that's what they said.
I picked up my MBP and spoke to a customer service rep on iPhone4 launch day so they were a little busy and the actual "Genius" that worked on my laptop wasn't available for me to talk to or demonstrate the issue for.
Honestly, I'm not sure if I believe them but I am sure that I have little additional time to mess around with it.
Message was edited by: jkositarut - didn't realize that the vernacular term for post-digestive gas emission was taboo.
Message was edited by: jkositarut

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