A chair convertible into a chaise lounge comprises: a stationary base structure having a front section and a rear section, a sitting unit including a seat portion and a backrest portion, wherein the seat portion is inclined with respect to a horizontal plane; and two foot-rests, each of which has a portion for resting the feet and a portion for resting on the floor. The mounting plate includes a central mounting hole and six peripheral mounting holes symmetrically disposed about the central mounting hole. If both flags match and the media type indicator is write once, the drive is prevented from writing to the user data area if both flags are in the data written state.