Disk Utility can't format !

Hello,
Since Leopard, Disk Utility can't format external HD (or USB key or anything else). There is an error and the HD can't mount anymore.
If I use a Mac under Tiger, there is no problem to format ans the HD is usable under 10.5.x.
This problem isn't fix in 10.5.0, 10.5.1 or 10.5.2.
I tested with my iMac and my MacBookPro. Same problem.
Anyone got an idea ?
Thanks

To dechamp :
HD is connected with a FW hub. maybe it is the problem :/
I will retry when it's connected directly.
I have 4 FW external HD and only 1 FW 400 on the iMac ... so the HUB is really important
But to format, I can plug directly, or via USB
Time Machine is ON, but not working on this HD
I'll continue my tests
Thanks !

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