So, I recently got this http://imgur.com/a/9SUUV pop-up from windows saying that my disk was about to fail soon and that I should create a backup immediately before my data is lost. This warning was about my C:/ drive so I backed up all my data and then downloaded CrystalDiskInfo only to be greeted by this image: http://imgur.com/a/zo6yq. Apparently my 10+ year old HDD isn't doing to well. Does this mean it's going to stop working soon? What does "Reallocated Sector Count" really mean? Thanks in advance.

https://en.wikipedia.org/wiki/S.M.A.R.T.
https://en.wikipedia.org/wiki/Bad_sector

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A backup a day keeps DR away.