Not sure if this is the issue or not, but there is mention of superblock errors in the FAQ but it's spelled with a hyphen:

http://www.riocar.org/modules.php?op=mod...;faqent=162#162

FAQ was mostly based on Mark's help in this thread:

http://empegbbs.com/ubbthreads.php/ubb/showflat/Number/328414

See if the info in there is helpful?