It is also desirable to provide a disc drive unit that can share an optical pickup with {HEAD ~ one or more than one other disc drive units} having {TAIL ~ respective pairs} of oppositely disposed guide shafts that are separated from each other by different distances by fitting such an adaptor member so as to reduce the cost 
having
It is also desirable to provide a disc drive unit that can share an optical pickup with { HEAD ~ one or more than one other disc drive units } having { TAIL ~ respective pairs } of oppositely disposed guide shafts that are separated from each other by different distances by fitting such an adaptor member so as to reduce the cost
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH