I might have found finally a solution. Seems that writing in a forum open your minds...
Here is what I did so that other can test and confirm eventually:
- I went through all Fusion options and noted in the advance USB the option of compatibility to USB3, as it was grayed when VM is running I did not noted before and it is true that the MyBook in question is USB3 (the default was set to 2.0 in Fusion). Strange enough it was working before, but cannot confirm what was the option of course.
- however, doing this and forcing the USB3 recog at start up was not enough as still the automatic installation of the driver failed.
- with that I googled more on USB Drivers and donwloaded the package from INTEL, and NOT Microsoft: Download Intel® USB 3.0 eXtensible Host Controller Driver for Intel® 8/9/100 Series and Intel® C220/C610 Chipset Family
After installing the INTEL driver in the Windows 7 VM then it finally recognized the drive.
I will do an extra test in the other VMs but I suppose this is the solution (if not will report back)