What is the best way to shut down an iMac that has frozen during a data transfer? The disk I was writing to will not eject. Stopping "copy items to" doesn't work either_ it is frozen as well. Is there a way to force eject the disk so I can shut down?

Some more information on the above: OS: 7.2
1. None of the shutdown commands would work so I held the power button down and received a prompt that asked if I wished to force eject the drive, I selected
the force eject and then shut down.
2. Just recently I installed an eSATA _ Thunderbolt_ port multiplier compliant PCIe card (Seritek Q6G) into a thunderbolt external chassis (OWC Helios) (seritek Q6G).
This freeze data transfer also happened when I connected a Firmtek 5PM external tower to the iMac via thunderbolt cable.
The driver for the seritek Q6G was installed in the iMac previous to connection of any of the devices.
Both external towers mount ok on the iMac but have frozen during data transfer.
The initial freeze was with the Firmtek 5PM which is (JBOD)_ I thought that might have had something to do with the freeze_ it being JBOD_ so next I tried the Mercury Elite AL Pro Q2- which is formated in RAID 5. But then froze too.
Anybody have any experience with this?
Maybe I need another driver?
Or maybe some update to my OS?
Any suggestions welcomed.
Thank you

Hello BDAqua, thanx for the suggestions. Before I saw this reply I tried to first quit the finder and then to relaunch the Finder but that resulted was a blank gray screen.
In the end I ended up having to power down the iMac.
Fortunately the RAID array that was "active" seems to be fine and also has a firewire 800 connection so I can use it_ just not with thunderbolt until this issue is solved.
I'm going to check in the Applications>Utilities>system log to see if any clues are evident_ thank you for the suggestion.
PS: Nothing of note was obvious as a root cause in the Activity Monitor though.
hmmm....I was told that the Helios and seritek card were compatable and that the Helios didn't require any drivers..it will be a drag if there isn't an easy fix for this since this new PCIe card from seritek is the first to offer port multiplier compatibility for eSATA to thunderbolt...since they are both new I'm hoping that an OS upgrade will be the fix (presently7.2)...we shall see.

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