Since installing lion, my mac no longer recognises my external hardrive also my ipad and iphone no longer automatically start itunes.

since installing lion, i can lo longer go to "my imac" and find external hard drives and other devices i plug into a usb hub. my ipad and iphone don't automatically open itunes only iphoto. my external hardrive used to also load automatically, now it doesn't and when i plug it in i can't find it. need some help i have some importanr things i need to transfer.

Try repairing the disk with disk utility, take a look at this link, http://support.apple.com/kb/HT1782

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