OS X Yosemite shuts down during boot (which is very slow)

Here is the situation. After upgrading to Yosemite I noticed my boot time slowed down, same thing happened with Mavericks so I didn't think anything of it, figured my 2011 Macbook Pro was just showing its age. Anyway last night the battery died. I go to plug it in and reboot it and it is taking a very long time to boot up, the little status bar got about half way across then it just shut down. I have tried resetting the PRAM and I have also tried running the disk repair utility in recovery mode, disk repair says the disk is unrepairable. I don't know what happened to cause this and if this has happened to anyone else. Any suggestions would be appreciated. I would like to avoid the cost of a new hard drive and or the time spent starting anew by wiping out this one but if that is what it comes down to then so be it. Anyway thank you for reading this long winded question and for any suggestions/help that is given.

Sounds like the hard drive is failing. Not that expensive to replace yourself.
http://eshop.macsales.com/shop/internal_storage/hard_drives_and_SSD
I assume 1TB WD is after market HD?
check warranty https://selfsolve.apple.com/agreementWarrantyDynamic.do

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