Time Machine has locked my external drive. HELP

Time Machine hosed me again. After several unsuccessful attempts to backup on my PowerMac G5 dual 2.33 Ghz, I was able to complete my first full backup to an external 2 gig DROBO (USB 2.0 interface). It took 20 hours to do 180 gigs.
Now I have just discovered that Time Machine has made that external drive READ-ONLY! I cannot write to the drive and neither can Time Machine.
Does anybody know what is up and how to fix this short of using root UNIX shell which terrifies me. I just want to take it off and cut my losses, but the drive also has a ton of music on it that iTunes uses.

Okay Jeffery, I think I've found the solution, especially if you are seeing the "Unknown" user in your Get Info window's Sharing & Permissions setting for your drobo.
I had written earlier about my work-around for getting my drobo to work right after getting the "read-only" error from Time Machine. But unfortunately it was a temporary and temperamental fix. There were times then I had to eject the disk and launch Disk Utility to run a repair on the disk which would take more than half an hour on my drobo. But all the while my permissions had this "Unknown" user. Well I decided to "Go UNIX" and see if I could fix this problem once and for all.
I opened up Terminal and typed "*ls -la /Volumes*". This gives me a directory listing of my mounted drive volumes. I noticed that all of my drives, internal, external, USB and FireWire, all had "root" as the user and "admin" as the group, _EXCEPT for my drobo!_ So I forced it to conform by changing it manually by typing "*sudo chown root:admin /Volumes/Drobo\ Backup\ HD/*".
sudo = temporarily enables root mode by asking for your password before executing.
chown = changes ownership to...
root:admin = "root" is the user and "admin" is the group.
*/Volumes/Drobo\ Backup\ HD/* = My drobo drive is named "*Drobo Backup HD*", but UNIX sees spaces as command separators, so you have to use the "\ " to signify spaces within a name.
After doing this over a week ago, _I have not had any other problems_ with using my drobo as a backup drive. It has never come up with the "read-only" error in Time Machine, the Sharing & Permissions setting do not have any "Unknown" users or groups, I don't even need to wait for my drobo before logging in like I did in the past. I just boot my Mac and everything with my drobo and Time Machine just works... No problems!
It seems to be permanently fixed for me, so if you are willing to try this solution, I'm sure it would work for you. If UNIX terrifies you too much, and you do not trust yourself editing the commands above, let me know the name of your drobo drive on your desktop and I will post a message with the EXACT UNIX commands customized for just for you, so all you have to do is copy and paste them into your Terminal window to do it. But like I said, I've done this over a week ago and I not had one single problem.

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