External Hard Drive Issue - Jumbled Files!

Hi all,
I've been having a problem with my external hard drive jumbling files. This has happened to me on two different computers and with two different external hard drives, so I know it is not an isolated issue. Let me explain:
I notice the problem most when I am recording in Logic. I will save a song with the files all on the external drive. Then, when I go to open the song later, some sound clips have different clips in the spot where they were supposed to be! For instance, A file might have originally been named "Sound Recording #24" and it says the same thing above the waveform in Logic, but it now has a different clip inside of it!
So then I go to the finder and bring up my external drive, and here's where the crazy part happens. I click my audio files folder and see my list of audio files. but once I click on the track 24... it instantly switches to a different file name! It only happens with certain files, but when I click it, they switch instantaneously to something else! It is bizarre, and is almost as if the data is jumbled on the drive so it can't figure out what I'm clicking on!
This is making me really nervous because it is ruining audio projects that I have worked very hard on! It has been doing this on my Intel MacBook as well as my G4 Quicksilver. I had the same thing happen with both a Western Digital MyBook drive, and a Maxtor drive.
Has this happened to anyone, and does anyone have a solution?
Thanks,
Nate
MacBook and Power Mac G4 Quicksilver   Mac OS X (10.4.8)  

If the errors occur only while using the Logic it may just be application specific - try posting in this forum as well...
http://discussions.apple.com/category.jspa?categoryID=156

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