Unmount Problem

[Brian Clark <brianj ais ais-gwd com>]

Hi guys - whew!

If I mount my cdrom via:

[root localhost]# mount /dev/cdrom /mnt/cdrom

I can access it. If I want to change discs, the docs tell me to do this via:

[root localhost]# unmount /dev/cdrom

But when I try to unmount it, I get:

[root localhost]# unmount /dev/cdrom
unmount: Command not found.

So, being very new to Linux, I issued:

[root localhost]# which mount
/bin/mount

Ok, great. So I tried:

[root localhost]# which unmount
unmount: Command not found.

Ok, hmm... So I go to:

[root localhost]# cd /bin
[root localhost]# ls -alF u*
(of course it lists all files beginning with u)
and I see unmount*

So, my question is:
If mount is in /bin and I can mount the cdrom. Why can't I unmount the
cdrom when unmount in /bin also?
This Linux thing is starting to make no sense whatsoever.

Besides that, at one point I could access my Windows95 hard disk (hda) when
I issued:

[root localhost]# mount /dev/hda /mnt/master
[root localhost]# dir
file1
file2
file3
file4

(of course fileX being the actual file name of a windows directory)
And it spat back my whole C:\ directory tree.

But now, if I try to do the same thing, all I see is:

[root localhost]# mount /dev/hda /mnt/master
[root localhost]# dir 
. ..
[root localhost]#

What in the world is going on? I have read every man page and HOW-TO that I
could find on the subject, and I have come up empty. They keep telling me
to do what I have already done, and it's not working.

Thanks -

Brian