said {HEAD ~ track} determining means identifies all of said pilot signal reading means which have read said pilot signal based on the detection result provided by said pilot signal detecting means; and said means for sequentially selecting sequentially selects said selected read signals by selecting said {TAIL ~ read signals} read by respective reading means positioned at intervals of from a reading means next to one of said pilot signal reading means positioned at an extreme end within said pilot signal reading means, and determines the selected read signals as read signals read from the respective information data tracks 
said { HEAD ~ track } determining means identifies all of said pilot signal reading means which have read said pilot signal based on the detection result provided by said pilot signal detecting means ; and said means for sequentially selecting sequentially selects said selected read signals by selecting said { TAIL ~ read signals } read by respective reading means positioned at intervals of from a reading means next to one of said pilot signal reading means positioned at an extreme end within said pilot signal reading means , and determines the selected read signals as read signals read from the respective information data tracks
OTH HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH