The present invention provides a parts information management method and a parts information management system which allows efficient and optimal activities to be done when developing and improving a product. After receiving an indication that a first disk in the group has had a detected error, determining a consecutive number of detected errors for the first disk. If it is not possible to compress the block of data below the threshold, the SSD stores the block of data without any compression. The lower closure element includes hook members as engaging elements at said edges, which engage in the associated guide rails and which run substantially clear of the guide rails during normal operation of the open roof construction.