I tried to create a bootable USB using the command:
dd if=ubuntu.iso of=/dev/sdb
and I made a mistake. I typed sdb instead sdd. sdb being my second hard drive and sdd my USB drive.
I canceled the operation, but my hard drive is invisible now. Back in Windows 7, the Disk Management tool displays this hard drive with 3 sections, 2GB unallocated followed by 2MB healthy followed by 400 something GB unallocated.
Is there any way to recover my drive to the previous state after this mishap?