Shared external drive - user permissions setup

I've set a home LAN made of 3 iMac/eMac connected via Airport. I've recently added a 500 Gb firewire external drive connected to my iMac to manage backups. I divided it into 3 partitions (1 per user/xMac) and mounted them using sharepoints. It's all great; users can see, mount and use all partitions.
Here is the issue: I would like each user to only see and use his dedicated partition. I believe I must play with users and groups, but could not make it to work. I'm not very familiar with this and I'm afraid to make big mistake. Coud somebody help on this ?
iMac Mac OS X (10.4.9)

I should write one, but it's fairly simple once you get into it...
Click on the Groups tab, make a group name... say "PartitionA", click add group, repeat for 2 more groups... "PartitionB", "PartitionC".
Click on the Users & Public Tab, fill in for "Tom, "Dick", & "Harry".
Back to the Goups tab, higlight "PartitionA", then highlight "Tom", click the plus sign... repeat for the other two groups and users.
Now under "Normal Shares" tab, you can highlight a Share, then click on the Show File Properties button and assign a Group, and it's Permissions.

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That is not correct.
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I searched the forum, but nothing posted to other threads helped.
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Did you use the little "Show File System Attributes" yet?
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Did you use the enable Windows(smb)Sharing to Shared?
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sudo fsaclctl -p /Volumes/volumename -e
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So there seems to be a technical Bug:
If I share the drive as smb-Device, I can connect to it but don't have any content.
Konsole displays
26.08.12 08:21:13,000 kernel[0]: disk2s2: 0xc005 (UNDEFINED).
disk2s2 is my partition on my external drive.

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I can read but I can't write to an external drive.
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Why would a computer company let me read files but not write? Hahaha. This is insane.
I have to write computer files for work. It's a project due this morning.
Man, I'm going to have to go back to PC.
Just need the compter to write files.

If it's formatted as NTFS, reformat it as MS-DOS, exFAT, or Mac OS Extended (Journaled) as desired.
If it's formatted as FAT32 or exFAT, use the Disk Utility's Repair Disk command on it.
If it's formatted as Mac OS Extended, click Authenticate and provide your administrator password, or change the permissions on that specific folder in its Get Info window.
(72460)

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Name : OneTouch4
Type : Volume
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Shared external drive - user permissions setup

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