Sharing disabled for external hard disks?

After installing Lion, I find that I could not enable sharing for my external hard disks. I right-clicked each hard disk in Finder, checked the Shared Folder box and after I close the window and reopen it, the Shared Folder box is again unchecked. In System Prefs, I have already enabled File Sharing. Also, I could not do Screen Sharing as well. What could be wrong? I didn't have all these problems with Snow Leopard. Now my media player (on the same network) cannot see the two hard disks attached to my iMac.

If the external hard disk is connected via network, I found that if you connect to that hard disk through its IP address in a web browser and change it's folder preferences to (everyone can read/write), that will allow Lion to access the files.
I had the same situation, and this worked.  You can use a program called Magical Finder to locate the IP address.
http://www.iodata.jp/lib/product/m/3022_mac.htm
The site is in Japanese, but the software has English support.  Really easy to use, but you could probably use any kind of network scanning software to find the ip address.

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