I figured it out. Heres how to do it.

What seems to have happened is when I did this, I never moved the new umount into the /sbin directory.

What we've done is simply renamed the old umount to umount-orig and left the OS without a umount file.

So you've got two options

1- put the umount file you've made in /sbin (open terminal and type "open /sbin" without quotes. and drag it in

2-the safer option that i did

open terminal

type without quotes

"sudo -s"

"password"

"cd /sbin; mv umount-orig umount"

that will rename the file back to umount. problem solved.

Thanks for that, I followed your "safer approach" and I can now eject any external device just like before.

My only remaining issue is my external HDD just has Read permission and I can't figure out how to change it back to Read & Write. I tried in the 'Info' window of my HDD to click on the lock and manually add Write permissions but it stays gray and I'm unable to manually edit the permissions. Pictured here: http://i.imgur.com/KrnEO.png

Does anyone know how to change my external HDD permissions back to Write & Read in Terminal or any other method?

http://www.askdavetaylor.com/why_is_my_mac_hard_drive_suddenly_readonly.html

You can try that and let me know how it works