2.6.16 plus is
(2) have a read of /var/log/dmesg and messages and syslog and see if any mention of hdc is made
post those lines of output pls
also what is the ouput of your /etc/fstab file
3) also what fs types are on your drives and how did you format and partition the hdc drive?
eg did you pcL or a live cd and name of executable etc
4) boot up a live cd such as knoppix and let it try and hw detect....if it fails i suggest you redo the partition and format.....
you probably guess I am thinking your partition table is not quite right
so also mention what is the bios boot drive order pls