No access to usb flash drive within grub bootloader menu

[Ray Gllisse]

Hi,
I would like to boot from a usb flash drive selected in grub bootloader menu
I am using a linux iso image of kali distribution. The host machine is a windows laptop.
When I start the kali virtual machine, I manage to get to grub menu.
Unfortunately the usb flash drive isn't listed when ls command is typed. There's only
(hd0) (hd0,msdos1) even if the flash drive is connected to the guest.
When this Kali virtual machine has finished booting, there's no issue with flash drive.
Is it possible to get the virtual machine take into account the flash drive when the boot loader is in action ?
Thanks 

[RaSystemlord]

Just forget using physical media to boot-up VMs.

Use the ISO image itself and attach that as a CD/DVD in VM-settings. Create the VM first, don't load the OS. Then go to VM Settings change the above and everything else to your liking. Then boot-up the VM.

[louyo]

Use Plop (program to boot from USB drive in WS)