Can't unmount a hard drive

Since I use Leopard, Once I plugin a Firewire harddrive, it is not possible to unmount it unless I reboot the computer.
Tried to repair permissions, tryed to rebuild Directory tried… tried…
Drives (several) mount/unmount normally on my other computers (G4 Panther).
Has anyone seen this?
Thanks for your help.
OSX10.5.2, MacBook Pro 2,5GHz.

Yes, it says the disk is in use. The only way to unmount is to reboot the computer. Problem occurs on several FW drives.
When I try to repair with Disk Utility, it just hangs. Disk Warrior, Drive Genius can't find a problem. But, strangely, Drive Genius doesn't even allow to rebuild/repair the internal drive and DiskWarrior won't allow me to look at it either. If I try to repair it with Disk Utility, it does not work (hangs). If I also try to repair with Disk Utility once booted from the installation CD system, same thing. Doesn't get past a certain point and hangs.
Seems to me all this is related to the internal drive, even though some FW drives can mount/unmount without problem.
All external FW drives have been checked and/or fixed with another computer (G4/OSX10.3.9) and function perfectly with it. Not on Macbook Pro/Leopard.
Any help someone. After reading some posts it seems related to the same "unknown" problem…
Thanks

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ask as many questions as necessary! I know it is a confusing situation.
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I believe I upgraded last year to 10.3.9.
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Every once in a while it ALMOST acts like it wants to boot...I get a chime, or a chime with a burst of static, but even then, the hard drive then quiets down, the screen stays black, it goes silent, and the system remains dormant.
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Can't unmount a hard drive

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