Importance

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Abstract

A memory system, an interface system for accessing a physical sector on an electrically erasable media based upon a logical block number, and a method for mapping a logical block number to a physical sector on an electrically erasable media are disclosed. The erasable media has an erase block size larger than a write block size. The interface system interfaces a host processor to an electrically-erasable memory, such as a flash media. The host processor requests access to the memory based on a logical block number. The interface system uses a first portion of the logical block number to determine from a master index table a physical sector number of a table of physical sector numbers corresponding to the logical block number. The interface system uses a second portion of the logical block number to determine from the table of physical sector numbers the physical sector number on the media corresponding to the logical block number. The host processor is provided access to the physical sector having the physical sector number corresponding to the logical block number. A logical block number may be remapped to a physical sector that has been completely erased by updating the table of physical sector numbers corresponding to the logical block number. A plurality of physical sectors, which are marked as discarded are erased simultaneously.

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First Claim