Can I batch change user access to folders & file read-write permissions?

I had a corrupted user account on my iMac and after weeks of trying repairs I followed a forum suggestion to delete my account.
Before doing so I synced all my document folders and files (since 2004) over my LAN to an external hard drive that was attached to my MacMini. I then deleted the iMac account.
Next I backed up my Mac Mini user account with Time Machine. I then created a new iMac User account on the iMac and let the iMac access Time Machine to bring over all my MacMini preferences, settings, desktop, etc. I now have a fully functioning iMac user account.
Here is the problem. I attached the USB external drive directly to my iMAC. I can access some of the folders and files on the external hard drive. Most of them refuse to let me acces the folder or open a file. If I use the GET INFO command I see an "_unknown" user with "read and write". I see an "everyone" with "no access". I can individually change each folder and file to allow my user account access and give myself permission to read and write the files. I cannot delete delete the "_unknown" account.
It will take me days to individually change each folder and file manually like I am now doing.
Is there a way to use Automator to add my user account to the folder or file and give me read and write folder and file permissions?
Or is there any other way to do this in a batch change?
Is there something I need to do to the external files right now that will ensure that I can access them if either computer crashes and I need to replace the MAC? I would hate to have to go through this again. Would having a MAC server instead of an external drive solve this?
I am using MAC OS 10.6.8 with the most recent updates installed (as of today).
Thanks,
Sandi Dickenson

Select the icon of the external drive in the sidebar of a Finder window, and open the Info window. In the "Sharing & Permissions" section of the window, click the lock icon and authenticate. Make sure you have read & write access to the volume by changing the settings if necessary. Then, from the action menu (gear icon), select "Apply to enclosed items."
The "_unknown" user and group are assigned automatically to files on a volume with the "Ignore permissions" option set.

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Hello,
I have other question :
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ThanK's

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How do you create default Read/Write Permissions for more than 1 user?

My wife and I share an iMac, but use separate User accounts for separate mail accounts, etc.
However, we have a business where we both need to have access to the same files and both have Read/Write permissions on when one of us creates a new file/folder.
By default new files and folders grant Read/Write to the creator of the new file/folder, and read-only to the Group "Staff" in our own accounts or "Wheel" in the /Users/Public/ folder, and read-only to Everyone.
We are both administrators on the machine, and I know we can manually override the settings for a particular file/folder by changing the permissions, but I would like to set things up so that the Read/Write persmissions are assigned for both of us in the folder for that holds our business files.
It is only the 2 of us on the machine, we trust each other and need to have complete access to these many files that we share. I have archiveing programs running so I can get back old versions if we need that, so I'm not worried about us overwriting the file with bad info. I'm more concerned with us having duplicates that are not up to date in our respective user accounts.
Here is what I have tried so far:
1. I tried to just set the persmissions of the containing folder with us both having read/write persmissions, and applied that to all containing elements.
RESULT -> This did nothing for newly created files or folders, they still had the default permissions of Read/Write for the creating User, Read for the default Group, Read for Everyone
2. I tried using Sandbox ( http://www.mikey-san.net/sandbox/ ) to set the inheritance of the folder using the methods laid out at http://forums.macosxhints.com/showthread.php?t=93742
RESULT -> Still this did nothing for newly created files or folders, they still had the default permissions of Read/Write for the creating User, Read for the default Group, Read for Everyone
3. I have set the umask to 002 ( http://support.apple.com/kb/HT2202 ) so that new files and folders have a default permission that gives the default group Read/Write permissions. This unfortunately changes the default for the entire computer, not just a give folder.
I then had to add wife's user account to the "Staff" group because for some reason her account was not included in that. I think this is due to the fact that her account was ported into the computer when we upgraded, where as mine was created new. I read something about that somewhere, but don't recall where now. I discovered what groups we were each in by using the Terminal and typing in "groups username" where username was the user I was checking on.
I added my wife to the "Staff" group, and both of us to the "Wheel" group using the procedures I found at
http://discussions.apple.com/thread.jspa?messageID=8765421&#8765421
RESULT -> I could create a new file using TextEdit and save it anywhere in my account and it would have the permissions: My Username - Read/Write, "Staff" or "Wheel" (depending on where I saved it) - Read/Write, Everyone - Read Only, as expected from the default umask.
I could then switch over to my wife's account, open the file, edited it, and save it, but then the permissions changed to: Her Username - Read/Write, (unknown) - Read/Write, Everyone - Read Only.
And when I switch back to my account, now I can open the file, but I can't save it with my edits.
I'm at my wits end with this, and I can believe it is impossible to create a common folder that we can both put files in to have Read/Write permissions on like a True Shared Folder. Anyone who has used windows knows what you can do with the Shared folder in that operating system, ie. Anyone with access can do anything with those files.
So if anyone can provide me some insight on how to accomplish what I really want to do here and help me get my system back to remove the things it seems like I have screwed up, I greatly appreciate it.
I tried to give as detailed a description of the problem and what I have done as possible, without being to long winded, but if you need to know anything else to help me, please ask, I certainly won't be offended!
Thanks In Advance!
Steve

Thanks again, V.K., for your assistance and especially for the very prompt responses.
I was unaware that I could create a volume on the HD non-destructively using disk utility. This may then turn out to be the better solution after all, but I will have to free up space on this HD and try that.
Also, I was obviously unaware of the special treatment of file creation by TextEdit. I have been using this to test my various settings, and so the inheritance of ACLs has probably been working properly, I just have been testing it incorrectly. URGH!
I created a file from Word in my wife's account, and it properly inherited the permissions of the company folder: barara - Custom, steve - Custom, barara - Read/Write, admin - Read Only, Everyone - Read Only
I tried doing the chmod commands on $TMPDIR for both of us from each of our accounts, but I still have the same behavior for TextEdit files though.
I changed the group on your shared folder to admin from wheel as you instructed with chgrp. I had already changed the umask to 002, and I just changed it back to 022 because it didn't seem to help. But now I know my testing was faulty. I will leave it this way though because I don't think it will be necessary to have it set to 002.
I do apparently still have a problem though, probably as a result of all the things I have tried to get this work while I was testing incorrectly with TextEdit.
I have just discovered that the "unknown user" only appears when I create the a file from my wife's account. It happens with any file or folder I create in her account, and it exists for very old files and folders that were migrated from the old computer. i.e. new and old files and foders have permissions: barara - Read/Write, unknown user - Read Only, Everyone - Read Only
Apparently the unknown user gets the default permissions of a group, as the umask is currently set to 022 and unknown user now gets Read Only permissions on new items, but when I had umask set to 002, the unknown user got Read/Write permissions on new items.
I realize this is now taking this thread in a different direction, but perhaps you know what might be the cause of this and how to correct or at least know where to point me to get the answer.
Also, do you happen to know how to remove users from groups? I added myself and my wife to the Wheel group because that kept showing up as the default group for folders in /Users/Shared
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Help!
Before you think this is the standard "iPhoto 6 permissions problem", please read on.
Upon installing iPhoto 6 and attempting to update my iPhoto Library, I get the dreaded "There is a problem accessing...files in your iPhoto Library folder...Make sure you have read and write permissions for the folder...all enclosed items." This is the problem noted in:
http://docs.info.apple.com/article.html?artnum=303135
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(124214)

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Can I batch change user access to folders & file read-write permissions?

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