Provided is a singulation method of a semiconductor device that can perform a sawing process while protecting a pad. It is used for these purposes in the form of compositions and method comprising the PMD and optionally a carrier. The permanent magnet has a magnetization from the first pole shoe to the second pole shoe, and is formed by a matrix with a magnetically active material embedded therein. Each device can be thought of as a separate family of bits, errors occurring in more than one family are not correctable, but may be detected if only one bit in each of two families is in error. The rotating magnet, which drives the spindle and a flywheel and also drives the swinging targets, could rotate in a steady speed rate of rotation due to the inertia of the flywheel.