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vcap@gce-fog-test-vm:~$ sudo mount -t ext4 /dev/sdb1 /mnt/failed-instance
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

vcap@gce-fog-test-vm:~$ dmesg | tail
[337830.721464] sd 0:0:2:0: [sdb] Write cache: disabled, read cache: disabled, doesn't support DPO or FUA
[337830.721913] sd 0:0:2:0: Attached scsi generic sg1 type 0
[337831.030512]  sdb: sdb1
[337831.031598] sd 0:0:2:0: [sdb] Attached SCSI disk
[337971.588313] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
[338062.322358] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
[338238.823298] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
[338280.008347] EXT3-fs (sdb1): error: can't find ext3 filesystem on dev sdb1.
[338289.163898] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem
[338299.394221] EXT4-fs (sdb1): VFS: Can't find ext4 filesystem