Lost disk permissions of usb-hd

Question

trying to lock my extern usb-harddisk
and save it against changements,
i made the mistake to lock it in the information window
i have 10.4 german version,
and try to find expressions of the english 10.4 to explain:
in the last part of the info window,
first pull down menu:
----you may: read&wright ,
----no rights ---> last expression i choosed.
since that i have no icon on the screen.
disk utility finds my hd
and -----verifiying appears to be ok
-----1hfs volume checked
------- volume passed verification
buttons --- verify disk permission
---repair disk permission,
---mount button (on the top)
are not usable (unactivated)
is it necessary to erase the volume,
to make it mountable?
how to get disk permissions back?
greetings
andreasmichael

Answer 1

thanks a lot!
i tried to follow the FAQ you requested,
with the following result:
Last login: Wed May 24 09:13:02 on ttyp2
Welcome to Darwin!
andreas-breiners-power-mac-g5:~ andreasbreiner$ :chmod 775 "/Volumes/hd232gb/"
-bash: :chmod: command not found
necessary to enter in a different manner?
(FAQ you requested:)
Q. I accidentally changed the permissions on a disk so that one or more of the permissions were set to No Access, and I can't see the disk to change the permissions back. How do I fix this?
A1. If the disk in question is your Mac OS X startup disk and your computer stops starting up at the blue screen, restart with the Command and S keys held down, and enter the following commands:
mount -uw /
chown root /
chmod 1775 /
exit
A2. If the disk in question has Mac OS X installed but isn't the current startup disk, open the Terminal in the /Applications/Utilities/ folder and enter the following:
sudo chown root "/Volumes/volumename/"
sudo chmod 1775 "/Volumes/volumename/"
sudo -k
You will be asked for your password when executing the first command; it will not appear in the Terminal window. Replace volumename with the disk's actual name. If you don't know what the disk's name is, choose Go to Folder from the Finder's Go menu, and enter /Volumes/ as the folder's path. Locate the item corresponding to that disk and drag it into the Terminal window; in this case, omit the quote marks and all text between them in the existing commands. Log out and back in.
A3. If the disk in question does not have Mac OS X installed, open the Terminal in the /Applications/Utilities/ folder and enter the following:
chmod 775 "/Volumes/volumename/"
Replace volumename with the disk's actual name. If you don't know what the disk's name is, choose Go to Folder from the Finder's Go menu, and enter /Volumes/ as the folder's path. Locate the item corresponding to that disk and drag it into the Terminal window; in this case, omit the quote marks and all text between them in the existing commands. If you get a message that you don't have permission to do this, proceed as indicated in situation 2 above, but use 775 as the number. Log out and back in.