A method for managing a memory apparatus including at least one non-volatile memory element includes: recording usage information of at least one block during accessing pages of the block; and determining whether to erase a portion of the blocks according to the usage information. The invention encompasses methods for induction and isolation of cytotoxic T cells specific for human tumors, cancers and infected cells, and for improved selection of genes that encode the target antigens recognized by these specific T cells. The interior surface is tapered resulting in the central bore’s diameter being larger at the trailing end than at the leading end and the exterior surface has a greater taper angle than the taper angle of the interior surface. Also, a method of programming and erasing a memory device is provided. An antenna, screws, power switch, charging receptacle and all mounting hardware are included.