LaCie External Drive No Longer Recognized

My LaCie d2 Hard Drive (Extreme) suddenly is no longer recognized. This may or may not have anything to do with my copying several files to it just prior, with much memory still available on it. I rebooted my computer twice and it was still not there. Is this a crash? Should I kiss that drive goodbye? If not, any suggestions?

Bizarre. After some time it now appears, and apparently with all files on it. I thought the cable was already secure on both ends, but perhaps it appeared after tightening them just slightly. Do you think that was it?

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