A device mounting rail (114) for use in mounting a peripheral device (112) in a computer system (100) comprises first and second elongated sides (120, 122). The first elongated side (120) engages the peripheral device (112) when the device mounting rail (114) is used to mount the peripheral device (112) in the computer system (100). The second elongated side (122) engages a retaining wall (128) within the computer system (100) when the device mounting rail (114) is used to mount the peripheral device (112) in the computer system (100). The second elongated side (122) is also compressible toward the first elongated side (120) to generate a spring force. When the device mounting rail (114) is used to mount the peripheral device (112) in the computer system (100), the spring force maintains the peripheral device (112) in a substantially rigid relationship to the retaining wall (128) of the computer system (100).