Optical disk device and startup method of optical disk

A startup method of an optical disk in which the optical disk is identified from among a plurality of types of optical disks and is started up, the method comprising:

• an identification step in which a type of an optical disk which is inserted is identified;
• a selection step in which a startup mode corresponding to an identified type of an optical disk is selected from a storage device which stores a startup mode corresponding to a type of an optical disk;
• a first startup step in which a startup process is performed based on a selected startup mode;
• an obtaining step in which related information related to the optical disk which can be obtained during the startup process at the first startup step is obtained;
• a mode limiting step in which a group of startup modes to be selected next is limited from among a group of startup modes stored in the storage device based on obtained related information when a startup error occurs during the startup process;
• and
• a second startup step in which a next startup mode is selected from among the group of the startup modes limited in the mode limiting step when a startup error occurs during the startup process and a startup process is performed based on the selected startup mode.