Sądzę, że to lepiej opisuje zadanie, jakie wykonuje "recovery ROM", niż "pamięć odtwarzalna" (płyta CD w takim ujęciu to też pamięć odtwarzalna".

There are actually two copies of the CMS image in flash ROM. This is a failsafe mechanism: should the first copy fail to boot the processor (for instance, because it was corrupted by a power failure during an update), the second copy, called a "recovery ROM", is used on the next reboot. It is assumed that if CMS fails to set some internal watchdog register within a few million cycles after bootup, the primary ROM is assumed to be corrupted so the recovery ROM is used.