Micron Technology, Inc.
HANDLING ASYNCHRONOUS POWER LOSS IN A MEMORY SUB-SYSTEM THAT PROGRAMS SEQUENTIALLY

Abstract:

A system includes a non-volatile memory (NVM), and a volatile memory to store: a zone map data structure (ZMDS) that maps a zone of a logical block address (LBA) space to a zone index; and a high frequency update table (HFUT). A processing device is to: write, within an entry of the HFUT, a value of a zone write pointer corresponding to the zone index for an active zone, wherein the zone write pointer includes a location in the LBA space for the active zone; write, within an entry of the ZMDS, a table index value that points to the entry of the HFUT; and journal metadata of the entry of one the ZMDS or the HFUT affected by a flush transition between the ZMDS and the HFUT.