Help!My Mac doesn't find my external hard disk

Today when I tried to open my mac it "stuck" on the first white screen (by the way my external hard disk was already connected).So, not know what to do, I disconnected the hard disk without ejecting it first, since my computer hadn't opened yet and then I switched it off using the switch off button. However, when I switched on my computer again it couldn't find the biggest part of the disk. I have to say that the external disk is split in 2 parts, Lacie and Exchange, in order to use it in both mac and windows respectively. Is there anything I can do to "make it come back"? Please, tell me that it's not lost...I've restarted it but yet nothing...

If you've followed Randy's suggestions above, and you say nothing shows up on the camera's LCD when you're connected (like DV IN), then I might suspect a bad firewire cable.
Remember, the Easy Setup should be chosen first; then you should be capturing into the project with that Easy Setup. If you've chosen the DV NTSC setup, what happens when you open the log and capture window? Does it say "VTR OK" under the view window, or does it say "NO COMMUNICATION?"
If the latter, again, you may have a bad cable. If you're getting the VTR OK, then try controlling the camera with the transport controls in the log and capture window. It should work.

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