BSOD When Waking Computer & Randomly Dismounting HDD

I've been having two main problems recently. One being a BSOD upon waking up a sleeping/hibernating computer and two being a randomly dismounting HDD.The former problem has been happening for well over a year, but I've just kind of ignored it. Recently, my computer's starting to BSOD even when its not waking up, so I thought I might want to finally take a look into what's happening. If anyone would be kind enough to tell me how to post dump logs, I will gladly supply them.The latter problem also is a recent occurrence and happens sporadically. I know this isn't the exact forum to post this in, but I thought I'd mention it to see if it is somehow connected. Sometimes I'll try to access Mozilla or a shortcut on my desktop and a message will pop up, notifying me that that file is unavailable for access. Then I check "computer" and see that my main data drive (the HDD) has disappeared! This problem remedies itself once I've restarted my computer but is still none-the-less disconcerting. Does this hint at a failing hard drive? It's important to note that when I try to back up the HDD or check disk it, it usually will disappear in the middle of my attempts, or my computer will BSOD and fail to complete the tests.