I know this thread is old but what the OP is asking happened to me.
I have two drives, a 128Gb SSD which I had Windows 8 loaded on and a regular 1Tb hard drive set up with 4 other partitions (D, E, I & V).
I had a good system recovery image on a USB stick, plus I also had current drive images (macrium images) on my I drive.
One day I was doing something, don't remember what or why, but knowing that I had a good recovery drive + images, I deleted the Windows partition on my first drive and rebooted with the recovery stick to do a reset. The problem is that during the reset prompts there was NEVER a prompt that eluded to my second drive being wiped, but that is exactly what happened.
My first drive was wiped and the second drive wiped as well. I know there is a documented step that indicates you can choose just the drive Windows is installed on, but in my case, that step never was shown (guessing because since I deleted that partition, it did't 'see' a Windows 8 installation).
Fortunately I had my macrium images stored on another media source so I could recover, but my guess is that when the reset feature didn't see a Windows 8 OS on my C: drive, it (for whatever reason) wiped both drives. I don't understand it but I most definitely did.
I set everything back up and now I would never use the reset feature again. My main reason is that I like to have complete control over image backup and restore. When you use a 3rd party like Ghost, Macrium, True Image, etc, you have 100% control over the options. With Windows 8 reset, you never see what it's about to do until too late.
Lesson learned.