When attempting to mount an external USB hard drive formatted with NTFS to a WRT600N Linksys router running dd-wrt you might receive a set of errors similar to the below.
Errors from DMESG:
SQUASHFS error: Can’t find a SQUASHFS superblock on sd(8,1)
FAT: Did not find valid FSINFO signature.
Found signature1 0x4e0005 signature2 0xd6e80000 sector=1.