Abstract:
A hard disk drive includes a housing module configured to accommodate one of many different types of hard disk modules. Each hard disk module includes a number of connectors. The housing module includes a connecting board, and different types of connectors protruding from the connecting board, corresponding to the connectors of the different types of hard disk modules.

Description:
BACKGROUND 
     1. Technical Field 
     The disclosure relates to a hard disk drive. 
     2. Description of Related Art 
     A hard disk drive includes a housing module and a hard disk module mounted in the housing module. If the hard disk module needs to be replaced, a new housing module is needed to accommodate the new hard disk module, which increases the cost, and even wastes the old housing module. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, all the views are schematic, and like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is an exploded, isometric view of an exemplary embodiment of a hard disk drive; the hard disk drive includes a housing module, a first sized hard disk module, and a second sized hard disk module. 
         FIG. 2  is similar to  FIG. 1 , but viewed from another perspective and not showing the second sized hard disk module. 
         FIG. 3  is an assembled, isometric view of the housing module and the first sized hard disk module of  FIG. 2 . 
         FIG. 4  is similar to  FIG. 3 , but showing a cover removed from the housing module. 
     
    
    
     DETAILED DESCRIPTION 
     The disclosure, including the accompanying drawings, is illustrated by way of examples and not by way of limitation. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one. 
     Referring to  FIGS. 1 and 2 , in an exemplary embodiment, a hard disk drive includes a housing module  10 , and a 3.5-inch hard disk module  20  and a 2.5-inch hard disk module  20   a  selectively and detachably mounted to the housing module  10 . 
     The housing module  10  includes a bracket  12 , a connecting board  14  mounted in the bracket  12 . The bracket  12  is divided into first and second receiving rooms by the connecting board  14 . The first receiving room  120  which is located adjacent to the front side of the bracket  12  is smaller. Sidewalls of the first receiving room  120  define a number of through holes  122 . The second receiving room (not labeled) which is located adjacent to the back side of the bracket  12  is larger, and configured to accommodate a power supply and other elements to execute the function of the hard disk drive. 
     Opposite ends of the connecting board  14  are mounted to opposite sides of the bracket  12 . A set of first type of connectors  142  extend into the first receiving room  120  from the connecting board  14 . A set of second type of connectors  144  extend into the first receiving room  120  from the connecting board  14 . 
     The 3.5-inch hard disk module  20  includes a number of hard disk devices  22  and a cage  24  for receiving the hard disk devices  22 . Sidewalls of the cage  24  define a number of fastening holes  242 . A circuit board  26  is detachably mounted to the back side of the cage  24  and is electrically connected to the hard disk devices  22 . A number of connectors  262 , corresponding to the first type of connectors  142  of the housing module  10 , protrude from the circuit board  26 . 
     Similarly, the 2.5-inch hard disk module  20   a  includes a number of hard disk devices, a cage, and a circuit board having a number of connectors corresponding to the second type of connectors  144  of the housing module  10 . 
     Referring to  FIGS. 3 and 4 , in assembly, the 3.5-inch hard disk module  20  is inserted into the first receiving room  120  of the housing module  10  with the hard disk module  20  partially received in the first receiving room  120 , and the through holes  122  in alignment with the fastening holes  242 . A number of fasteners  30  extend through the through holes  122 , and are engaged in the fastening holes  242 , thereby, the 3.5-inch hard disk module  20  is mounted to the housing module  10 . In this state, the first type of connectors  142  is connected to the connectors  262  of the 3.5-inch hard disk module  20 , with the second type of connectors  144  abutting against the circuit board  26  of the 3.5-inch hard disk module  20 . In this embodiment, the fasteners  30  are bolts. 
     In replacement of the 3.5-inch hard disk module  20  with the 2.5-inch hard disk module  20   a , the fasteners  30  are released, then, the 3.5-inch hard disk module  20  is removed from the housing module  10 . Thereafter, the 2.5-inch hard disk module  20   a  is mounted to the housing module  10 , with the second type of connectors  144  of the housing module  10  connected to the connectors of the 2.5-inch hard disk module  20   a , and the first type of connectors  142  abutting against the circuit board of the 2.5-inch hard disk module  20   a.    
     It is believed that the present embodiments and their advantages will be understood from the foregoing description, and they will be apparent that various changes may be made thereto without departing from the spirit and scope of the description or sacrificing all of their material advantages, the examples hereinbefore described merely being exemplary embodiment.