My external HD with TM backup has disappeared

I have a 1TB Titanium Green external hooked up to my Mac Mini with an 800 Firewire cable. It has two partitions, one containing the TM backup of my Mavericks system and the other containing a spare Mavericks startup disc and other vital files. Both have suddenly disappeared from my desktop, do not show up in the finder or disc utility, have simply vanished. Anyone else have this problem and is there any solution?

Well, if the drive is audibly spinning up and whirring away, it is likely intact and working.
I noticed on my Sister's iMac that her FW-800 port on the iMac is very loose, and the cable actually falls out of alignment with its pins, thanks to Earth's gravity. Indeed. Not kidding. So, I bonded the cable in place with some caulking. Ghastly, I know, but she can back-up reliably now.
Another thing, Cables can in fact fail. It's a fact. Do you have another FW-800 cable kicking about, or does the drive have a USB port or FW400 on is back plane, that you can attach to the Mini differently?
Last but not least, did this Titanium drive come with its own software suite? If you installed it, uninstall the suite and/or driver. Western Digital drives are known for their suite to actually destroy the drive on Mavericks. Check System Preferences, Users & Groups control panel, and then the 'Login Items' button tab at top, and hit the '-' minus sign to get rid of any drive software that's loading on start-up -- any number of recent Mac OS X Updates could have rendered this incompatible.
Best,
- Neil.

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