Is it possible to recover data and/or restore partition structure of the underlying logical partitions of an extended partition? I unintentionally wiped the first boot sector of /dev/sdb1 instead of the entire disk. I was under the impression I'd wiped the MBR so I eventually overwrote it as well. Fortunately, I'd copied the partition structure from testdisk prior to this, so I still have the partition table information. However, when I try to mount any of the partitions, mount fails to recognize that the filesystem is ext3.