A method and system for migrating a computer operating system to a personal computer includes the process of and instructions for detecting dynamically the type of disk operating system network device to be booted by an associated DOS network by examining or parsing the contents of the personal computer CMOSBIOS. A method includes imaging at least a portion of a top surface of the structure. As few as two staples per sub-assembly can be used to retain the water-jacket and slab core in their sub-assembly. One or more vent holes 111a for discharging air, introduced into an internal space of a second motor 61, to the outside are formed in a bottom wall portion 111 of a cup-like member 105 of a second impeller 63.