5. When the key servers details are all entered, the USB flash drive encryption configuration  window opens. In this step, master encryption key copies are stored in the USB flash  drives. If there are fewer than three drives that are detected, the system requests that you  plug in more USB flash drives, as shown on Figure 12-52. You cannot proceed until the  required minimum number of USB flash drives is detected by the system. Figure 12-52 Prompt to insert USB flash drives 674  Implementing the IBM System Storage SAN Volume Controller with IBM Spectrum Virtualize V8.2.1