Dell OptiPlex 960 (Late 2008) - Manual (Page 50)

20. Insert the previously formatted USB device into a USB connector on the Provisioning Serverr.
21. Click the Download USB key file link to download setup.bin file to the USB device. The USB device is recognized by
default; save the file to the USB device.
If additional keys are needed in the future, the USB device must be reformatted before saving the setup.bin file
to it.