Apparatus for holding information storage media such as a disk (4) having an aperture therein, the apparatus comprising: a base portion (2) and engaging means for releasably engaging the information storage media via said aperture, the engaging means comprising: at least one arm (1) resiliently cantilevered to the base portion (2), retaining means (5) for engaging and retaining the information storage media (4) on the apparatus, and release means (3A, 3B) depression of which releases engagement between the retaining means (5) and the information storage media (2), locating means (7) being provided for receiving a security member (6) as it is inserted beneath the engaging means in a first direction parallel to the base portion (2) so as to inhibit operation of the release means (3A, 3B), the locating means (7) being arranged to locate the security member (6) laterally as it is inserted beneath the engaging means.