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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External harddrive read only

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Hi jesusbet,
Thanks for visiting Apple Support Communities.
It sounds like the USB 3 ports on your MacBook Pro are not operating at the expected speed.
The first troubleshooting step I'd suggest in this case is to reset the System Management Controller (SMC) on your MacBook Pro using these instructions:
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Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
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Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
From:
Intel-based Macs: Resetting the System Management Controller (SMC)
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cosifan wrote:
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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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Solved!
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Likely Final Update: WD Support sent me a link to download / install SmartWare and solve the problem I was having with the SmartWare software ("Drive Settings" was greyed out). Once I got SmartWare back up and running I was able to change the "Drive Settings" within SmartWare. As the last update suggested, I modified the sleep timer settings and security (password settings) and tested to get the following results:
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You didn't say what model mac you have. First reset the PRAM:
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Any of these hubs should work.
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External harddrive reads on only 1 USB

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