doesn't the mount command show you your currently mounted filesystems, and /etc/fstab those that you have defined? also, if you need to know any info about your partitions, use some partitioning program like fdisk (the linux-one); when you run
(if you have it installed, I guess you have), it gives you help on how it's run. I think it was like this:
for the first harddisk, and of course use /dev/hdb for the second one. but anyway, running plain "fdisk" shows you what to do
and with fdisk you can fool around as much as you want, but if you do NOT want to save (apply) the changes, simply quit the program without saving (check out it's info...it says something like "press m for info" at the beginning, so press m and check out which letter quits without saving. was it q?)