Memory disk

A memory disk structure includes a storage device, a hollow casing, an elastic member and a base. The storage device has a connector and a main body. The connector is installed in one end of the main body. The hollow casing has an opening and a recess with a protrusion. The elastic member and the base are attached to the main body, and the base has an engagement portion. When the connector passes through the opening of the hollow casing to make connector pushed into the hollow casing, the elastic member is deformed to make the engagement portion wedge in the recess and against the protrusion, and when the body is pushed into the hollow casing and the connector is exposed outside the hollow casing, the elastic member is fastened at the first recess to prevent the storage device from departing from the hollow casing.