Dual-cell or multi-cell Wireless Transmit Receive Units configured to implement mobility procedures are described. The method of formatting the disk comprises identifying a first quantity of the storage portions; and labeling the first quantity of storage portions as non-addressable storage portions such that the non-addressable storage portions cannot be accessed by a user or a disk drive. The bandwidth size to be used during the silence period can be set to the bandwidth required for the transmission of an SID packet.