System and method for managing trim operations in a flash memory system using mapping tables and block status tables
US9323667B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 2013 |
| Grant date | Apr 26, 2016 |
| Priority date | — |
| Expiry date | Apr 19, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/7209
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and system for managing a flash memory system facilitates the use of TRIM or similar operations so as to release physical memory space of logical block addresses (LBAs) that are declared to be deleted by a user file management system. A plurality of data structures corresponding to levels of indirection are used to manage the mapping between a user logical block address and the physical location of the data in the flash memory system and to respond to user read and write requests by determining the current status of the user logical block address in the frame of reference of the memory system. This process substantially decouples TRIM management from garbage collection and wear leveling operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.