Okay, so I've recently shifted to Mac from Windows. I was curious to check out what the Yosemite OS looked like, and hence I downloaded the beta and had it up and running. It was downloaded on the primary hd.
There were already a few backups on my time machine, so I decided to erase the primary macintosh hd and restore the backups. Everything got erased and it's all lying as a corestorage unit now. It says that there is no available space and all the options have been greyed out. I don't know how to create the partitions now and all efforts are in vain. Any help would be appreciated.