US 2014/0006884 A1Published application

Data converting method, data converting apparatus, and computer product

AssigneeFujitsu Limited

InventorTerumasa HANEDA

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Abstract

A data converting method includes counting for each bit pattern among bit patterns that a data segment of a specific number of bits can assume, the number of data segments that have the bit pattern, where the data segments are segments of write_data written to a storage medium storing two types of bit values among which a first value has a higher error occurrence rate than a second value; correlating a bit pattern selected as a conversion source pattern, from among the bit patterns in descending order of count results, with a bit pattern selected as a conversion target pattern, from among the bit patterns in descending order of quantities of the second value respectively included in the bit patterns; and converting for each conversion source bit pattern, data segments having the conversion source bit pattern, into converted data segments having the correlated conversion target bit pattern.

Claims14

Dependent claims

A data converting method executed by a computer, the data converting method comprising:

counting for each bit pattern that appears in a group of data segments and is among a group of bit patterns that a bit string of a specific number of bits can assume, the number of data segments in the group of data segments, having the bit pattern, the group of data segments being created by segmenting write_data by the specific number of bits, the write_data being written to a storage medium having a property that among two types of bit values stored in the storage medium, a first value has a bit error occurrence rate that is higher than that of a second value;
correlating a bit pattern that is selected as a conversion source pattern, from the group of bit patterns in descending order of count results obtained at the counting, with a bit pattern that is selected as a conversion target pattern, from the group of bit patterns in descending order of quantities of the second value included in the bit patterns, respectively;
and
converting for each conversion source bit pattern, data segments included in the group of data segments and having the conversion source bit pattern, into converted data segments having the conversion target bit pattern correlated with the conversion source bit pattern.

1 more element

A data converting apparatus comprising:

a counting unit that for each bit pattern that appears in a group of data segments and is among a group of bit patterns that a bit string of a specific number of bits can assume, counts the number of data segments in the group of data segments, having the bit pattern, the group of data segments being created by segmenting write_data by the specific number of bits, the write_data being written to a storage medium having a property that among two types of bit values stored in the storage medium, a first value has a bit error occurrence rate that is higher than that of a second value;
a correlating unit that correlates a bit pattern that is selected as a conversion source pattern, from the group of bit patterns in descending order of count results obtained by the counting unit, with a bit pattern that is selected as a conversion target pattern, from the group of bit patterns in descending order of quantities of the second value included in the bit patterns, respectively;
and
a converting unit that for each conversion source bit pattern, converts data segments included in the group of data segments and having the conversion source bit pattern, into converted data segments having the conversion target bit pattern correlated with the conversion source bit pattern.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 13/855,000Filed 2 Apr 2013
Priority: JP 2012-14739029 Jun 2012
Published: 2 Jan 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G06F 11/006
Error detection; Error correction; Monitoring: identification
G06F 11/004
Error detection; Error correction; Monitoring: error avoidance
H03M 13/27
Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability…:…
H03M 13/2957
Combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes: turbo…