You fstab specifies UFS (BSD filesytem) type while
fdisk detects it as Linux Native.(ext2fs ?)
Code:
/dev/ad1s1 /maxtor ufs rw 2
Next problem is your mount of a reserved label "c", which should not be used in mounting, because that label designates the size of the slice/partition.
Code:
/dev/ad0s3c /second ufs rw 2 2
What is the output of
bsdlabel /dev/ad0s3?