 It is named after Mount Rainier, a volcano near Seattle, Washington, United States.Mount Rainier can be used only with drives that explicitly support it (a part of SCSI/MMC and can work over ATAPI), but works with standard CD-R, CD-RW, DVD+/-R and DVD+/-RW media.The physical format of MRW on the disk is managed by the drive's firmware, which remaps physical drive blocks into a virtual, defect-free space.