Yea, diskpart created a new partition! He destroyed your data!
Does this look familair?
It's kind of fun to do the impossible! -Walter Elias Disney
Removes any and all partition or volume formatting from the disk with focus. On master boot record (MBR) disks, only the MBR partitioning information and hidden sector information are overwritten. On GUID Partition Table (GPT) disks, the GPT partitioning information, including the Protective MBR, is overwritten. There is no hidden sector information.