External disk not working with Mac OS X 10.5

Posted by ctx2002 on Super User See other posts from Super User or by ctx2002
Published on 2009-07-15T23:06:04Z Indexed on 2010/03/31 19:03 UTC
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Hi:

My OS is 10.5.7. I have an external hard disk, formatted as Mac OS Extended (Journaled), connected to my Mac machine through USB cable.

I have used it for a while, but now it is not working.

Error showed in /var/log/system.log.

USBF: 2521.384 AppleUSBEHCI[0xa515800]::Found a transaction which hasn't moved in 5 seconds on bus 0xfd, timing out! (Addr: 0, EP: 0)

.....

......

kernel[0]: USBF: 2588.616 [0xa6baa00] The IOUSBFamily was not able to enumerate a device.

Luckily, in my work place there is a Mac with OS 10.4, so I had plugged the disk into the 10.4 machine and it worked!!!

I did checked "System Profiler" on both machines (10.5, 10.4). Under usb section, for 10.5 it shows USBEHCI, under 10.4, it shows USBOHCI.

I am not a expert on USB Device , can any one tell me why 10.5 cause the problem.

it was worked under 10.5

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