Hmm, I saw the same thing happen to me once upon a time (I believe when I upgraded to beta13), and never really worked out what caused it.

Anyway, here's the fix:

rw
echo "/dev/hdc4 /drive1 ext2 defaults,ro 1 1" >> /etc/fstab
ro


It's *very* important to ensure that you use ">>" and not ">" in the above line. ">>" tells the shell that the input is to be concatenated (ie appended) to the existing file. ">" would overwrite the file completely.
If you're at all unsure, then perhaps backing up the /etc/fstab file first would be a good idea;


cp /etc/fstab /etc/fstab.bak


While you putting that line in, you might also want to consider also;

echo "/dev/hda2 /programs0 ext2 defaults,ro 1 1" >> /etc/fstab
echo "/dev/hdc2 /programs1 ext2 defaults,ro 1 1" >> /etc/fstab


which will make ({re|un})mounting /programs0 and /programs1 easier.