An mechanism for retaining devices in a computer system is disclosed herein. A computer storage device enclosure includes an chassis configured to house a computer storage device. The chassis includes a storage device retention mechanism. The storage device retention mechanism includes a flexible retention member disposed along and connected to an outer side wall of the chassis. The flexible retention member is configured to retain a rear corner of the storage device installed in the chassis by contacting a side, rear and upper surface of the storage device at the rear corner.