Dell POWEREDGE 1950 - Manual (Page 7)

Information Update
7
Figure 1-1. Internal USB Connector Location
To boot from the USB memory key, you must configure the USB memory
key with a boot image and then specify the USB memory key in the boot
sequence in the System Setup program. See "Using the System Setup
Program" in the
Hardware Owner’s Manual. For information on creating
a bootable file on the USB memory key, see the user documentation that
accompanied the USB memory key.
NOTE:
USB keys that contain multiple LUNs (Logical Unit Numbers) must be
formatted using the format utility provided by the key manufacturer.
NOTE:
To avoid interference with components inside the system, the USB key must
conform to the following maximum dimensions: 11.68mm thick (0.46") x 24.89mm
width (0.98") x 66.8mm length (2.63").
1 system board 2 internal USB connector location
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2