Sharing external drive not possible since 10.8

Hi,
I have an usb-device attached to my imac (mac os x journaled and a fat32 usb-stick). There are the normal entries under /Volumes/*.
Before my upgrade to 10.8, I could just mount that drive via network other macs (10.6 + 10.7) like usershome or public folders.
In 10.8 everything appears (Macintosh HD, user-home, public folders and any other folder I share) except these external drives or any folder I share on these drives.
I log on to the imac via my apple-id (seems to be new in 10.8?).
Any idea what changed? Or how to fix that?
Thanks

So there seems to be a technical Bug:
If I share the drive as smb-Device, I can connect to it but don't have any content.
Konsole displays
26.08.12 08:21:13,000 kernel[0]: disk2s2: 0xc005 (UNDEFINED).
disk2s2 is my partition on my external drive.

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This is how I currently use one of my Aperture Libraries. For the purposes of discussion, let's say I have only one computer, it is a laptop, I regularly work in more than one location, and I also work at home.
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I have read a few different threads relating to this question, with no real luck of a permanent solution.
I have an external drive that works perfectly on my Macbook Pro. My new iMac will not show the drive though (both with the current software).
The drive itself shows a power light and appears to be running/powered by the USB port.
I have tried several ports.
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The iMac has only been used since Christmas day, 2014 - and has had this problem since that day (in which i solved it by the turn off/unplug thing).
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Happy new year!

Some USB-powered drives are just crappy. They require too much current from the USB and cause the bus to fail or the bus can't provide enough power for it to fully spin up. You can often hear or feel them clicking periodically (like once a second) as they are trying to spin up.
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JS,
I had some trouble following macmenno's instructions, but have had almost complete success. If you DO have your original itunes library file, this should work for you too.
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My harddisk was failing but warned me, so i copied the ENTIRE itunes folder to an external drive. The iTunes folder includes the "itunes library" file, the music folder, and the xml file. This was suggested in a book i have on iLife as the best way to backup itunes to an external HD to preserve playlists, et al. But the book failed to say how to copy the folder back if needed.
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SB
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