| 摘要 |
PROBLEM TO BE SOLVED: To determine the quantity of mounted modules according to the purpose of their use by constituting a module receiving means so that any of modules equipped with various functions can freely be inserted and extracted and the connector of any module can be physical freely attached to and detached from the connector of any back board. SOLUTION: An opening part 21 is formed at the front part of an enclosure 2 as the module receiving means of this magnetic disk drive 1 and a back board 3 is provided at the inner part and provided with the proper number of back board connectors 31 in the same shape. Various modules 5 having individual functions can freely be inserted into and extracted from the opening part 21. A module 5 contains various elements constituting the module 5 in a module enclosure 51 as a chassis means all in the same shape irrelevantly to the function and a module connector 52 which can freely be attached to and detached from the back board connector 31 is arranged on the back.
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