An gasket is disclosed for environmentally sealing an enclosure of a disk storage device. The gasket, which is disposed between a base and cover portion of the enclosure is designed to accommodate a flat flexible wiring cable (flexcircuit) protruding therethrough.The gasket includes a compressible seal portion attached to the inner edge of a rigid plastic frame. The thickness of the seal is made slightly greater than the thickness of the frame. The width of the seal is substantially smaller than the width of the frame. A relief is formed on one surface of the gasket to receive the flexcircuit. The relief includes a groove extending across the width of the gasket. The groove has a depth essentially the same as the thickness of the flexcircuit, and a width slight larger than the width of the flexcircuit.Two ridges are formed across the entire width of the compressible seal portion of the gasket in the area immediately adjacent to the groove. During assembly, the excess compressible material in the ridges of the seal is deformed and displaced to fill the voids between the walls of the groove and the edges of the flexcircuit to ensure a continuity of the seal of the disk storage device enclosure.