Machine switch to power off

[Sizy458]

My virtual machine have a virtual disk vdi file hosted in the USB external disk.
When this external disk is diconnected, no dialog box "read error disk
Abort Retry Ignore"
is showing.

Imagine that there is a false electrical contact of a USB port to the external disk.
This dialog box which is not showed if for avoiding power off and restart virtual machine.

It would require the implementation of a dialog box Read error disk with button
Abort Retry Ignore, and possibility to REOPEN (fopen) the VDI file if the usb disk
is reconnected again.

Thank.