Dell Precision M2400 (Mid 2008) - Manual (Page 133)

Insert the previously formatted USB device into a USB connector on the Provisioning Serverr.
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.