Maverick does not see External Harddrive

I had a Seagate external usb3 harddrive connected. I was working on a video file when suddenly I got a message in the upper right hand corner saying that the external harddrive was incorrectly disconnected or dismounted. OK. So, I unplug and then plug the ext. HD back into the usb3 port. To make the story short, the hd light comes on, I can hear the disk spinning. But it does not appear in the Finder or desktop. The only sign on the Mac is by going to the "About This Mac" and to the System Report which lists hardware and software. Clicking on the USB line, it shows the external HD plugged into one of the usb 3 ports. The disk info indicates its ID and other data and how much energy it is consuming (it appears it is only using 96 mA from an available 500 mA). So, it appears that the Mac sees it and can read it and has power enough to run it.
I then removed the first ext. HD and inserted another Seagate external usb3 harddrive - the Mac doesn't see it either except in the System report. The external HDs do not show up in the Disk Utility app. The only conclusion is that the harddrives are probably OK but the Mac won't mount them anymore. Most people with unmountable ext. HDs usually see them in the disk utility (greyed out).
Any ideas.

Update - I have three Seagate FreeAgent GoFlex external harddrives. The two that I have connected to my Macbook Pro no longer can be read. I took the two and connected to another MacBook Pro but it would not read the drivers either. I took my third drive which I have not connected to my Macbook Pro for several weeks and connected to the other Macbook Pro and it reads it fine.
I downloaded drivers from Seagate but it didn't help. I started my computer in safe mode, HD didn't work. I have another drive containing a duplicate of my internal HD (using Superduper) and booted with the backup drive. It would not open the two drives. I'm taking the HD to a friend who has a G5 using an early Mac OS, 6.0. These two drives contain my video files and I need to retrieve the files.
Conclusion: The Maverick on my computer has corrupted the first two Seagate drives.

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Message was edited by: iddrew

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Sorry for short novel I am writing. I just wanted to cover as much backround as possible.
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