Micron Technology, Inc.
Flash memory block retirement policy

Abstract:

Devices and techniques for a flash memory block retirement policy are disclosed herein. In an example embodiment, a first memory block is provisionally removed from service in response to encountering read errors in the first memory block. Memory pages of the first memory block are tested in a second mode comprising reading memory pages at different read voltages. A raw bit error rate (RBER) or a read window budget (RWB) is determined for memory pages at the different read voltages and the provisionally removed first memory block is returned to service or retired based on the determined RBER or the RWB.