I had a 480 GB SSD with Windows 7 on it. I had a 120 GB SSD with Linux Mint 14 and BackTrack 5 on it.
I was using GRUB 2 to boot to the operating systems. It was a flawless install consisting of installing Windows 7 first, then disconnecting SATA cable on Windows 7 SSD, installing Linux Mint then BackTrack 5 on other SSD. Then, using
install grub2 update to find Windows 7 boot member and install to Grub 2.
Again, no problems at all.
I had another 750 mechanical hard drive that I wanted to use for Windows (NTFS) backup. So, I popped in the GParted Live CD, created a new 750 GB (obviously, it wasn't actually 750 GB) partition with NTFS file system, and then created the new partition. At some point, GParted asked me whether the disk had a GPT partition table, and I clicked "yes." O_o
Anyway, I rebooted, and then Windows 7 SSD is gone. Nothing on Grub 2 about Windows 7. Just Linux Mint and BackTrack. What happened? I am almost 100% certain that I did not delete the primary SSD with Windows 7 on it. I was very cautious, and I only have one HD with that much storage space on it (i.e., 750 GB) so it would have been nearly impossible for me to mistake it for another one.
So, in this whole process, was there anything besides that that I could have done that would have caused the Windows 7 to be completely wiped out? I mean, it said "unallocated space," as thought it wiped clean.