I'm running a Macbook Core Duo with OSX 10.4.10, and ever since i upgraded awhile back, my USB hard drive isn't recognized. The curious thing being that my parent's iMac recognizes it just fine. very frustrating. I've tried resetting the pram and whatnot, erasing the disc, reformatting the disc, verifying the disc, offering burnt sacrifices to the disc gods, etc. Here's some of the kickers - on my macbook, it's not recognized on disc utility, in the finder, nowhere, but under more info in about this mac, it shows up as a USB external storage thingamajig. Also, when i pop in the OSX install disc for my MB and boot from that, THAT disc utility DOES recognize it! Also, i've discovered that I can't repair disc permissions on my external hard drive, i'm not sure if that matters. Right now it's formatted as OSX extended (journaled) and the Apple System Partition option. Any and all help appreciated.