Hard drive access and permissions

Hello people who know.
I must admit to not fully understanding the whole permissions thing yet, and having just brought back a drive partition that disappeared due to a permissions error I feel I need some clarification. I lost an external FW partition from my desktop but I knew it was still there. I could see it in disk utility. Thanks to searching this forum I managed to get it back using terminal prompt.
I have an external 300GB firewire drive partitioned with 4 splits. A partion each for the iMacs 2 users. A scratch partition and a Backup partition. The scratch never has data put on it and the Backup is used purly for backing up my Mac HD.
One of the user partions is mine and I am the admin of the system. The other user partition is my partners. I would like it that I can read and write to her partition and she can read and write to mine, but I don't want anyone to be able to access the Backup (read or write) other than myself. The scratch disk I want to behave as just that, for whoever is logged in, using whatever app is set up to use it.
So, how should all my permissions be set in the Get Info window for each drive and if anyone has the time, why are they set that way?
I should have asked this question ages ago just didn't get round to it.
Thanks in advance.

Each of the two user partitions should have their permissions set up as follows:
Owner: The account associated with that partition
Group: A group containing both your and your partner's accounts. If no group exists with that membership, see below.
Owner permissions: Read & Write
Group permissions: Read & Write
Other permissions: Read Only
The backup partition should be set up as follows:
Owner: Your account
Group: Your group
Owner permissions: Read & Write
Group permissions: Read Only
Other permissions: Read Only
On all of the preceding three partitions, every item at the top level of them should have No Access for the accounts you don't want to have access to the drive. Using No Access on a disk or partition often causes it to disappear from the Finder for any account.
The scratch partition should be set up as follows:
Owner: Any account
Group: Any group
Owner permissions: Read & Write
Group permissions: Read & Write
Other permissions: Read & Write
To create a new group in Mac OS X, open the NetInfo Manager in the /Applications/Utilities/ folder, duplicate the admin group, and change the duplicate's membership to the accounts you want in the group. Choose a new name for that group, and change the gid from 80 to 400 or another number in the 400-499 range which isn't in use.
(18998)

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Hard drive access and permissions

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