FireWire vs USB at hibernate mode

Well I have the following task/issue. I have iMac and installed SamrtSleep 3rd party utility. It put my IMac in hibernate mode once system goes sleep. I have made for UPS setup so when power is off iMac will hibernate.
The problem is I have several external hard drives - FireWire and USB. Anytime I wakeup after hibernate the USB drives is unplugged and plugged again (software mode) and it breaks everything (if any) what was busy with this external drive and Not Properly Ejected warning appear. For example I have image file on external USB mounted before sleep. After wakeup it's unmounted like if I will just switch hard disk off while running.
However my FireWire works just fine the same way like internal hard drive. I have virtual machine image file on FireWire disk. I open and run it. Than go to hibernate and wakeup. The system stays same place where it was before sleep. Noting was unmounted/unplugged. I was able to continue work on Mac OS as well as in same place in virtual machine.
First I was looking for help here and All Over The Google but all issues is around how to unmount all external drives before sleep. But I don't need to unmount them I need hibernate them together with all system.
Also when wakeup my virtual machine notice me where to plug many USB devices (it always ask when new one is connected). It means when Mac OS wakeup from hibernate it "break" all USB connections however nothing happens with FireWire.
My question so far if its possible to put USB in some mode when it will not "break" on wakeup? Or maybe any other solution to hibernate USB disks.

Ok nobody asnwer maybe it's not clear and too many text. I will ask more easy way.
Why Mac OS reconnecting all USB devices after deep sleep?

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