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Researchers Submit Patent Application, "File System for Flash Memory", for Approval

June 17, 2014



By a News Reporter-Staff News Editor at Information Technology Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors KIM, Jin-soo (Seoul, KR); KIM, Je-min (Seoul, KR); KIM, Hyeong-jun (Suwon-si, KR), filed on November 26, 2013, was made available online on June 5, 2014.

The patent's assignee is Research & Business Foundation Sungkyunkwan University.

News editors obtained the following quote from the background information supplied by the inventors: "The following description relates to a file system for a flash memory.

"A file system refers to a concept of storing, withdrawing, and updating a set of files, and includes a concept of organizing a plurality of files in a byte stream. Generally, a file system manages access to data or metadata, and an available space of a storage medium. Accordingly, one of the main functions of the file system is to reliably manage the metadata.

"A fourth extended file system (EXT4 file system) among the file systems is mainly used in Linux, which maintains and manages an individual file having a size of 16 gigabytes (GB) to 16 terabytes (TB) in a file system, and maintains and manages a file system having a size of one exabyte (EB). There are a super block, a block bitmap, an Mode bitmap, and an Mode table in main metadata of the EXT4 file system. It is important to reliably manage the metadata, as described above."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

"In a conventional EXT4 file system, general data and metadata corresponding to the general data are divided into respective blocks to be written and managed in blocks. A metadata block includes a small amount of data, undergoes continual accessing and writing thereto. However, when a metadata block is stored in a memory system which operates in a multi-level cell (MLC) mode and continually accessed and written, degradation in performance occurs since the metadata block is backup in a paired page coupled due to a reliability issue.

"In addition, since two bits are stored in a memory cell in the MLC mode, the time at which a cell reaches the end of its lifetime due to frequent accessing and writing of data (so called 'wear-out' state) is earlier in the MLC mode than in a single-level cell (SLC) mode. That is, there is a problem in that a usable life of a memory that operates in the MLC mode is shorter than that of a memory that operates in the SLC mode.

"Accordingly, when metadata of a file system is stored in a cell that operates in the MLC mode, the consequential degradation in performance and shortened life significantly affect reliability of the whole memory.

"The present disclosure relates to a file system with higher reliability compared to a conventional file system.

"In addition, the present disclosure relates to a file system with a longer life compared to a conventional file system.

"According to a general aspect, a memory system includes a memory having a predetermined information storage space, a general data block in which pieces of general data are stored in the information storage space of the memory, and a metadata block in which metadata related to the pieces of general data is stored in the information storage space of the memory. The metadata corresponding to at least one piece of general data is grouped and stored in the metadata block.

"According to another general aspect, a memory system includes a memory including a predetermined information storage space, a general data block in which pieces of general data are stored in the information storage space of the memory, and a journaling block journaling the pieces of general data. Journaling data corresponding to the pieces of general data is grouped and stored in the journaling block.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIGS. 1 and 3 are block diagrams schematically showing memories according to exemplary embodiments of the present disclosure; and

"FIG. 2 is a diagram for schematically describing operation of a multi-level cell.

"Throughout the drawings and the detailed description, unless otherwise described or provided, the same drawing reference numerals will be understood to refer to the same elements, features, and structures. The drawings may not be to scale, and the relative size, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience."

For additional information on this patent application, see: KIM, Jin-soo; KIM, Je-min; KIM, Hyeong-jun. File System for Flash Memory. Filed November 26, 2013 and posted June 5, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=681&p=14&f=G&l=50&d=PG01&S1=20140529.PD.&OS=PD/20140529&RS=PD/20140529

Keywords for this news article include: Information Technology, Information and Data Storage, Research & Business Foundation Sungkyunkwan University.

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Source: Information Technology Newsweekly


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