Recovering ext4 superblocks

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http://unix.stackexchange.com – Recently, my external hard drive enclosure failed (the hard drive itself powers up in another enclosure). However, as a result, it appears its EXT4 file system is corrupt. The drive has a single partition and uses a GPT partition table (with the label ears). fdisk -l /dev/sdb shows: Device Boot Start End Blocks Id System /dev/sdb1 1 1953525167 976762583+ ee GPT testdisk shows the partition is intact: 1 P MS Data 2049 1953524952 1953522904 [ears] ... but the partition fails to mount: $ sudo mount /dev/sdb1 a mount: (HowTos)