Holder for a planar data storage medium

A holder for a planar data storage medium, comprising

• a first opening through which the planar data storage medium is insertable into a storage area of the holder in an insertion direction within the plane of the planar data storage medium;
• a retaining mechanism resiliently biased to resist removal of the planar data storage medium from the storage area in a direction opposite to the insertion direction;
• the holder being configured to enable a pressure to be applied to the planar data storage medium to overcome the bias of the retaining mechanism, thereby allowing the planar data storage medium to be removed via the first opening in the holder;
• and
• the retaining mechanism comprising one or more protrusions, each protrusion being formed as an integral part of an interior surface of the holder, and being resiliently biased to a blocking configuration in which the protrusion projects inwardly from the interior surface of the holder to restrict the passage of the planar data storage medium between the first opening and the storage area, each protrusion being arranged to change from the blocking configuration to a non-blocking configuration by application of said pressure to said planar data storage medium to allow the planar data storage medium to move between the first opening and the storage area;
• wherein each one or more protrusions is formed from two deformable strips of material, each deformable strip being located at one of its ends on an interior surface of the holder, whereas the other ends of the two deformable strips are separated from each other by a gap, the strips of material being deformable from the blocking configuration to the non-blocking configuration under the insertion or removal pressure when contacted by the planar data storage medium.