A composition comprising a colloid that is stable under physiological pH and ionic strength is disclosed. The control section compares a line width of the registration mark with a predetermined reference value of the line width to discriminate between abnormality and normality. The suggested retransmission setting includes one or more of a component selection setting, a link adaptation setting, a power control setting, and a scheduling setting. The read commands are set to read data of a plurality of separated logical blocks of the peripheral unit respectively. Due to rotation of the gate shaft, the detent element can be transferred from a start position, along the return groove, into a target position. Dynamic data allocation also allows efficient data storage of snapshotspoint-in-time copies of virtual volume pool of storage, instant data replay and data instant fusion for data backup, recovery etc.