as embarrassing as it sounds I managed to dd a debian iso to an external hd instead of my usb pen drive.
now my 1.5 tb western digital has 1 700mb partition named debian and the rest is unallocated space.
if I understand correctly how dd works the first 700mb of data in the disc are lost since they have been overwritten.
is there any way to save the rest?
//the disk was ntfs partitioned