Seagate 1TB won't mount after mavericks upgrade

Last night I upgraded my White early 2009 macbook from snow leopard to mavericks 10.9.2 and now i cannot mount my Seagate 1Tb external usb hard drive, It appears in disk utility and the drive is there but the partition on the second line is faded and it will not mount. When i try to mount the drive i simply get an error telling to run first aid but first aid simply tells me that i need to format the drive. as this is my main drive with all my back ups on it i do not have another drive that can hold all of my data. also when i booted the macbook into the recovery module after holding option at startup the drive appeared healthy and fine under disk utility there but under the full os i cant open it in Finder. Its not the drive as i can use it perfectly fine on my other laptop and pc. I need this resolved asap please

Not without making some applications unusable.   A clone backup can restore the notebook back to the prior operating system, if you made one prior.  Or if the last Time Machine backup was of the prior operating system, the internet restore can be done to the prior operating system.
But installing an old operating system on a new, you will find newer applications will not work on older operating systems if they weren't designed for them, or weren't installed on them.  Not to mention some drivers that existed may create untenable problems in the same manner.
You can modify your internal hard drive partitioning without erasing it, but that is risky if there is anything invisible that is marginal about the internal drive.   I would still make a clone backup before attempting it if there was none made before.
At this point I'd try to recoup the loss on the hard drive if it is past the return period where you bought it from on http://www.gazelle.com/ and then get a compatible hard drive from http://www.macsales.com/ to make any clone you need.   If there is any data you need on that hard drive, recoup the loss after you install an older operating system on a USB Flash drive such as a 32 GB.
Sources for getting each Mac OS X version prior are on my user tips:
https://discussions.apple.com/docs/DOC-3761 and earlier.

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