METHOD AND APPARATUS FOR POWER LOSS RECOVERY IN A FLASH MEMORY-BASED SSD

摘要

The present invention relates to a storage device that uses a flash memory that performs power loss recovery, and to a method of power loss recovery by using the storage device using the flash memory. The storage device stores change information on metadata in physical pages in which one or more logical pages are compressed and stored. The change information on the metadata is information representing how the metadata is changed in association with data in the one or more logical pages. The storage device may synchronize the metadata in the flash memory and recover the metadata by applying the change information on the metadata to the synchronized metadata when a power supply is disrupted.

主权项

1. A storage device comprising:
a flash memory to store data; a metadata synchronization unit to store, in a first physical page, metadata used to manage the data stored in the flash memory, and synchronize the metadata to the flash memory; and a page storage unit to store, in a second physical page, change information on the metadata and compressed data on at least one logical page, wherein the change information on the metadata is information on a change in the metadata associated with the data on the at least one logical page.