2nd HARD DISK DISSAPPEARED..HELP!!!!!

someone PLEASE help me...i have 2 years of data on this disk.
My 2nd hard disk disappeared from my desktop and Finder. I see it in Disk Utility, nad verified it and says everything is ok. This all happenned when i creatd a user account under my admin, and i changed the "ownership nad permissions" on that 2nd user to NO ACCESS. I guess something messed up. After i selected NO ACCESS on that 2nd user, i went back to my admin account, nad i couldn't access the disk there. i tried cahnging the disk to READ WRITE in my admin, but it wouldn't change, kept being no access. 20 minutes later after messing around, the disk is GONE from desktop and Finder....HOW DO I GET IT BACK?
thanks in advance to anyone who can help.

SO, i did this and it worked
Choose Go to Folder from the Finder's Go menu and enter /Volumes/ as the folder's location. Next, open the Terminal in the /Applications/Utilities/ folder while keeping the Volumes folder open. Type the following into the window:
chmod 755
followed by a space. Drag the volume in question into the Terminal window and press Enter. Log out and back in, and see if the drive reappears on your desktop
Now, my question is....how do i do what i want to do? How do i get my second user (standard) to not see or simply not be able to use the 2nd hard disk, while me, admin, of course can see the 2nd hard drive.

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