UPDATE:
The Airport Extreme runs multiple USB discs through a USB hub without any problems when I use a POWERED USB 2.0 hub. The discs are formatted HFS+ and I have no size restrictions in my transfers.

Finally.

/

UPDATE:
I have found the root cause of the instability on my set-up. Summarizing the set-up is:
Airport Extreme base station
USB hub
2 USB discs connected to the Airport Extreme via the hub
1 printer also connected to the hub

So; the problem is the USB hub.

When connecting the USB directly to the Airport Extreme base station all file copies works.

Next; is to test with a more efficient USB hub, maybe with separate power supply.

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So.. after a lot of hassle the disc is working ok. I have 2 USB discs connected to an Airport Extreme (see earlier post as well). I’ve had file closing or input-output errors and I’ve been unable to update ID3 tags through Amarok.

The ID3 tags is still somewhat unstable. The situation is ok now running a stable release of Hardy Heron and mounting through standard CIFS with iocharset=utf8 in FSTAB. The connections seems sensitive but work most of the time if I’m not stressing the disc with other tasks.

This is a great post on fixing the shut-down timeout problem that occurs with CIFS discs.

After upgrading I had two issues.

1) No sound. Through command line and alsamixer I maxed the volume on PCM and the sound was back.

2) Firefox had completely distorted rendering, size and font size. In the URL type about:config, filter on dpi and set the value to 96 dpi. Firefox is fine again.

Otherwise the upgrade seems ok; there are a few crashes here and there.