I can't scan a flash drive in Kaspersky Rescue Disk

[Juan Díaz]

Hello everyone!
I'm trying to disinfect a USB flash drive with important files without risking my pc, so I use Kaspersky Rescue Disk for that matter. 
The Problem is that when I plug in the flash drive while I'm in the Kaspersky Rescue Disk's Live System, it doesn't show up in the scan window alongside the volumes of my hard disk. Although the flash drive does appear in the file manager. 
Can someone help me please?

My system specs:
Windows 7 Starter Service Pack 1 32-bit
Kaspersky Rescue Disk 18