BSOD Using HDD For Extended Periods Of Time

I've decided to join the forum seeking for help with this problem I'm facing on a relatively new Dell XPS 15 laptop. The machine is around 7 months old, has Windows 7 Home Premium 64 bit edition installed (OEM) and has been updated to SP1. The problem first appeared when trying to backup files to an external 2 TB WD hard drive. While backing up the files, explorer.exe crashed, and my browser and iTunes crashed rapidly after, all giving some random address 0x. as the cause of failure. Around 15 seconds after this, I receive a BSOD with KERNEL_INPAGE_ERROR written at the top, and a notification at the bottom that the physical memory dump FAILED with status 0xC0000010. I thought that maybe I was straining the hard disk too much by transferring so many files at once, so I reboot the system, only to get a notification after POST that "there was a disk error, press CRTL-ALT-DEL to reboot". After doing this, the system rebooted, went into startup repair, rebooted again, and boot up normally. Ever since this ocurrence (which was a week ago) I've been getting random BSODs when doing random things on the computer, but mostly, when doing hard drive intensive operations. However, an interesting thing to note is that the subsequent BSODs did not contain the error message KERNEL_INPAGE_ERROR at the top anymore, but reported a STOP 0x0000004f at the bottom, and the same FAILED status for the physical memory dump. I tried running a chkdsk, but found no errors. I ran a DELL Memory diagnostics tool that found no errors. So I'm leaning towards a drivers issue.