If the Oracle System Assistant software is corrupted on the USB flash drive, you should try to repair it before replacing the USB flash drive.
Oracle System Assistant uses a specially formated USB flash drive. Do not replace the Oracle System Assistant flash drive with a standard flash drive. If the Oracle System Assistant USB flash drive fails and it cannot be repaired by reloading the Oracle System Assistant software, contact Oracle Services and request a service call to have Oracle System Assistant USB flash drive replaced.
For instructions for troubleshooting and repairing Oracle System Assistant, refer to the Oracle System Assistant troubleshooting information in the Oracle X5 Series Servers Administration Guide at http://www.oracle.com/goto/x86AdminDiag/docs.