Using an External Hard Drive - Photo Thumbnails dissappear

Not sure if this is the correct place, but I'm not talking about any application in particular.
I just purchased a Western Digital External Hard drive. MyBook Essentials. I've gotten everything I wanted copied over and deleted from my MacBook. I was in the process of organizing my photos - rotating them, deleting the fuzzy ones, ect - and after about thirty minutes of work all the thumbnails went to the generic JPEG look.
I can double click to bring up Preview, and see the photos - they're all there still. But I was using the thumbnails for quick previews.
I don't know if it makes a difference, but for further information, I was using the flow when they all started going out. And it wasn't immediate - first the one I was working on changed to JPEG, then as I scrolled so did the others.
I need my thumbnails!
Also, another side note - I have also seemed to have lost my iTunes album artwork in condsoladating and transfering my library to the EDH as well.
Help with both these problems would be greatly appreciated!

For some reason this sometimes happens when using CoverFlow for an extended period of time. Try relaunching the Finder, which often cures the problem. You'll want to close your Finder windows, then hold the Option key and click and hold the click on the Finder icon in the Dock. You should then see a fly out menu, with the last item being "Relaunch Finder"--select it. All Finder windows, if you left them open, will close and the Desktop will "blink" as Finder quits and relaunches. This generally fixes the problem, at least for awhile.
As for the album art work: there is a lengthy article about moving the iTunes Library here:
http://www.ilounge.com/index.php/articles/comments/moving-your-itunes-library-to -a-new-hard-drive/48
If that doesn't help you should try asking in the appropriate iTunes forum:
http://discussions.apple.com/forum.jspa?forumID=789
Personally, I store the actual music one place, and the iTunes folder, with the "Album Artwork" is left in my home Music folder. So far this has worked fine for me.
Francine
Francine
Schwieder

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