KR101753397B1 - Method of avoiding bad block in case of reading memory - Google Patents

Abstract

The present invention relates to a bad block avoiding method for a memory lead.
In the case where an ISO file is read from a NAND flash memory as a data storage medium in a mobile communication terminal in order to recognize a mobile communication terminal connected through a connection medium through a connection medium, A corrected block number table including block numbers for memory blocks storing actual data other than bad blocks among the memory blocks is generated so that the file can be read. And to provide a method of avoiding a bad block at the time of reading the memory by reading the ISO file normally by reading the memory data.

Description

METHOD OF AVOIDING BAD BLOCK IN CASE OF READING MEMORY BACKGROUND OF THE INVENTION 1. Field of the Invention [

The present invention relates to a bad block avoiding method in a memory lead, and more particularly, to a bad block avoiding method in a memory lead in which a mobile communication terminal connected via a connection medium is recognized as a CD-ROM, The present invention relates to a bad block avoiding method in a memory read mode in which an ISO file can be normally read by avoiding a bad block when a file is read.

Generally, the flash memory is divided into a NOR flash memory and a NAND flash memory. Among them, NOR flash memory, which is a code storage type, has been mainly used as a data storage medium of a mobile communication terminal because of its high read speed and excellent data stability. However, unlike in the past, in which a mobile phone has simply exchanged a short message, a mobile phone equipped with a mobile phone camera can store and store image data, a mobile phone capable of downloading and storing multimedia data such as ring tones, and a PDA A personal digital assistant (hereinafter referred to as " Personal Digital Assistant "), and a mobile communication terminal capable of storing or transmitting a large amount of data has appeared.

However, since NOR flash memory is more expensive than NAND flash memory and its structure is a structure in which memory cells are connected in parallel, there is a disadvantage in that the memory size becomes too large when a large capacity product is manufactured. Therefore, Was difficult. Accordingly, although the manufacturing cost is low and the NAND flash memory capable of manufacturing a large capacity product is being watched as a data storage medium of a mobile communication terminal in recent years due to its structure connected in series, it has a drawback of slow reading speed have.

However, NAND flash memory has a fatal disadvantage that it can have a bad block inside memory, unlike NOR flash memory. Here, bad block means a block which is destroyed and can not be recorded among the blocks constituting the memory. When data is stored in the block in the mobile communication terminal, the data is damaged. do. This bad block can be divided into a run-time bad block and an initial bad block. An initial bad block refers to a bad block generated when a NAND flash memory is first produced at a factory. A run-time bad block occurs during the use of a NAND flash memory Bad block.

1, when the mobile communication terminal 110 is connected to the computer 100 through a connection medium, the NAND flash memory is connected to the NAND flash memory, which is an internal data storage medium, Is commonly used.

However, since there is a possibility that the NAND flash memory has an initial bad block as described above, whether the ISO block can be normally read by avoiding the bad block area is detected by the computer 100 in the mobile communication terminal 110, Is recognized as a CD-ROM, and a program for viewing data stored in the mobile communication terminal 110 is automatically executed.

Accordingly, when there is a bad block in the NAND flash memory area in which the ISO file of the mobile communication terminal 110 is stored, the mobile terminal 110 collects the terminal produced in view of the defect of the mobile communication terminal 110 itself. Therefore, even if a bad block exists in a NAND flash memory area in which an ISO file is stored, there is a demand for a technique capable of normally reading an ISO file stored in the memory.

Therefore, the present invention provides a method for avoiding a bad block at the time of a memory lead when a computer reads an ISO file from a NAND flash memory, which is a data storage medium, in a mobile communication terminal and can normally read an ISO file by avoiding a bad block It has its purpose.

In order to achieve the above object, a method for avoiding a bad block in a memory lead according to the present invention checks whether or not each of the internal memory blocks of a mobile communication terminal connected through a connection medium is a bad block, A first step of generating a bad block accumulation number table for the memory blocks; A second step of extracting a cumulative number (k) of bad blocks matched for each block number (n) of the bad blocks in the memory blocks from the bad block accumulated number table and verifying whether or not the value is greater than 1; The third step of correcting the bad block accumulated number table so that the accumulated number of bad blocks matched from the block number n- (k-1) to the block number n-1 is increased by 1 ; A fourth step of generating a corrected block number table for the memory blocks by adding the value of the corrected bad block accumulated number table for each block number of the memory blocks; And reading the data stored in the internal memory blocks of the mobile communication terminal using the corrected block number table generated by the computer.

Preferably, the first to fourth steps are performed by the computer only when the mobile communication terminal is first connected through the connection medium.

According to the present invention, even when an initial bad block exists in an area where an ISO file is stored in the NAND flash memory, the computer can normally read the ISO file from the NAND flash memory installed in the mobile communication terminal. Accordingly, an error is prevented from occurring when the computer recognizes the mobile communication terminal connected through the connection medium as a CD-ROM.

1 is a view showing a computer and a mobile communication terminal connected to each other.
2 is a flow chart showing some steps of a bad block avoiding method in a memory lead according to the present invention.
FIG. 3 is a view showing a state where the accumulated bad block accumulated count table is generated according to the steps shown in FIG. 2. FIG.
4 is a flow chart showing the steps according to the invention after the steps shown in Fig.
FIG. 5 is a view showing a block number table generated according to the steps shown in FIG.

The following detailed description is merely illustrative, and is merely an example of the present invention. In addition, the principles and concepts of the present invention are presented as being most useful and readily explanatory.

FIG. 2 is a flowchart illustrating a method of avoiding a bad block in a memory lead according to an embodiment of the present invention. FIG. 3 is a flowchart illustrating a method of avoiding a bad block in a memory lead according to an exemplary embodiment of the present invention. Fig.

Hereinafter, the present invention will be described with reference to the respective steps of FIG. 2 and the drawings of FIG.

First, the computer confirms whether each of the internal memory blocks of the mobile communication terminal connected through the connection medium is a bad block, and generates a bad block accumulated number table for the memory blocks ( S200).

The mobile communication terminal stores information on a bad block indicating whether it is a bad block among internal memory blocks, and when the mobile communication terminal is connected to a computer, the information is transmitted to a computer. 3, the computer confirms that the blocks corresponding to the block numbers 2, 5, and 7 are the bad blocks, and the bad block accumulated number 0 value is stored in the block number 0, A value of 1, which is the cumulative number of bad blocks from block number 1 to block number 4, a value of 2, which is the cumulative number of bad blocks in block numbers 5 and 6, and a value of 3, from block number 7 to all block numbers As the accumulated number of bad blocks.

Then, the computer performs steps (S210 to S270) of correcting the value of the generated bad block accumulated count table, wherein the block number of the block corresponding to the bad block is removed from the memory blocks, It is necessary to newly create a table including only the block numbers of existing memory blocks.

In step S210, the computer determines whether the memory block of block number n (n: 0, 1, 2 ..) among the internal memory blocks of the mobile communication terminal is a bad block, In step S220, if the block number n is a bad block, it is checked whether or not the cumulative number k of stored bad blocks is greater than one.

In steps S230 to S250, if the accumulated number of bad blocks k is greater than 1, the accumulated number of bad blocks matched from block number n- (k-1) to block number n-1 is 1 < / RTI >

Referring back to FIG. 3, the operation of steps S210 to S250 will be described. In step S210, the computer confirms that block number 1 is a bad block. In step S220, it is confirmed that the cumulative number k of bad blocks stored in block number 1 matches the number of stored bad blocks k, which is not greater than 1, and steps S230 to S250 are not performed, and a memory block corresponding to the next block number If it is determined in step S260 and step S270 that the bad block is a bad block, the block number is incremented by 1, and if the incremented block number is not greater than the last block number, the process is performed again from step S210.

If it is confirmed that the block number 5 is a bad block, the computer checks whether the cumulative number of bad blocks stored in block number 5 matches the stored bad block number k in step S220. At this time, the cumulative number of bad blocks k stored in block number 5 is greater than 1, and the cumulative number of bad blocks matched in block number n- (k-1) is set to 1 . Accordingly, in this case, since n is 5 and k is 2, the block number is subtracted from 5 to 2, and a value obtained by adding 1, i.e., a cumulative number of bad blocks matched to 4 is incremented by one. In FIG. 3, since the cumulative number of bad blocks matched to the block number 4 is 1, it can be seen that the value is corrected to 2.

Then, the computer corrects the bad block accumulated count table so that the cumulative number of bad blocks matched from the block number n- (k-1) to the block number n-1 is incremented by one, so that k is 2 in step S240 The value 1 minus 2 is stored again as k value. Since the k value stored again in step S250 is not greater than 1, the computer increases the block number by one in step S260 and performs step S210 to determine whether the memory block indicated by the next block number is a bad block. The computer repeats steps S210 to S270 and confirms that it is a bad block if the block number is 7.

In step S220, the computer checks whether the cumulative number (k) of bad blocks stored in block number 7 matches the value stored in block # 7. At this time, the cumulative number of bad blocks k stored in block number 5 is greater than 1, and the cumulative number of bad blocks matched in block number n- (k-1) is set to 1 . Accordingly, in this case, since n is 7 and k is 3, the block number is corrected by incrementing the cumulative number of bad blocks matched to the value obtained by subtracting 3 from 7 and adding 1, that is, 5 times. In FIG. 3, since the accumulated number of bad blocks matched to the block number 5 is 2, it can be seen that the value is corrected to 3.

Since k is 3 in step S240, the computer stores the value of 2 minus 3 and 1 again as the value of k. Since the k value stored again in step S250 is greater than 1, the computer again performs a correction to increase the accumulated number of bad blocks matched to the block number n- (k-1) to 1 in step S230. Accordingly, in this case, since n is 7 and k is 2, the block number is subtracted from 7 to 2, and a value obtained by adding 1, that is, a cumulative number of bad blocks matched to 6 is incremented by one. In FIG. 3, since the accumulated number of bad blocks matched to block number 6 is 2, it can be seen that it is corrected to 3 values. Thereafter, in step S240, k is 2, so the value of 1, which is obtained by subtracting 2 from 1, is stored again as a value k, and since the k value stored again in step S250 is not larger than 1, the block number in step S260 is incremented by 1 , And if the block number incremented by 1 in step S270 is not larger than the last block number, steps S210 to S270 are repeated.

2 and 3, a process of generating a bad block accumulated count table for internal memory blocks of a mobile communication terminal connected through a connection medium and correcting the value of the generated bad block accumulated count table Respectively.

FIG. 4 is a flowchart showing a step according to the present invention after the step shown in FIG. 2, and FIG. 5 is a view showing a generation of a corrected block number table according to the step shown in FIG.

Hereinafter, the steps of FIG. 4 and FIG. 5 will be described, and the steps after the steps shown in FIG. 2 will be described.

The computer corrects the value of the bad block accumulation count table and then adds the value of the corrected bad block accumulation count table to each block number of the memory blocks to calculate a corrected block number A table is generated (S280).

In other words, as shown in FIG. 5, a value 0, which is a value of the corrected bad block accumulated number table added to the block number 0, and a value 1 of the corrected bad block accumulated number table are added to the block number 1 A value 3 obtained by adding 1 which is the value of the corrected bad block accumulated number table to the block number 2, a value 3 obtained by adding 1 which is the value of the corrected bad block accumulated number table to the block number 3, A corrected block number table having a value obtained by adding the value of the corrected bad block accumulated number table for every block number including a value 6 obtained by adding the value of the corrected bad block accumulated number table to 2 is generated.

It can be seen that the corrected block number table values include only the block numbers of memory blocks in which actual data exists, by removing the block numbers of the blocks corresponding to the bad blocks in the memory blocks.

The computer reads data stored in the internal memory blocks of the mobile communication terminal using the generated corrected block number table (S290).

Preferably, the computer generates the bad block accumulated count table for the memory block of the mobile communication terminal described above, corrects the value of the bad block accumulated count table, and generates the corrected block number table Only when the mobile communication terminal is first connected through the connection medium. If the mobile communication terminal is connected after that, the computer reads the data from the memory blocks of the mobile communication terminal with the corrected block number table that the computer has previously created.

Therefore, according to the present invention, even if there is a bad block in the NAND flash memory area in which the ISO file of the mobile communication terminal is stored, the computer generates the corrected block number table from which the block number corresponding to the bad block is removed It is possible to read only the data of the memory blocks in which the actual data exists, not the bad block, so that the bad block can be avoided and the ISO file can be normally read.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And can be modified.

100: computer 110: mobile communication terminal

Claims (2)

A method for normally reading an ISO file while avoiding a bad block when a computer reads an ISO file from a memory in an external device connected via a connection medium,
The external device stores information on bad blocks in the blocks of the internal memory and transmits the bad block information to the computer at the first time when the computer is connected;
Generating a bad block accumulation count table using the bad block information received from an external device;
Wherein the computer is further configured to remove a block number corresponding to a bad block from blocks of an internal memory of the external apparatus and to generate a table including only a block number of blocks in which actual data exists, And correcting the value of the reference value;
Generating a corrected block number table for the blocks of the memory by adding the value of the corrected bad block accumulated number table for each block number of blocks of the internal memory of the external apparatus; And
And reading the data stored in the internal memory of the external device using the corrected block number table generated by the computer. The method according to claim 1,
Wherein the step of correcting comprises: extracting a cumulative number (k) of bad blocks matched for each block number (n) of the bad blocks in the memory blocks from the bad block cumulative number table and checking whether the number is greater than 1;
The step of correcting the bad block accumulated count table so that the cumulative number of bad blocks matched from the block number n- (k-1) to the block number n-1 is increased by 1 A bad block avoiding method for a memory lead.

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