Scanning and management method for flash memory medium
A scanning method and media management technology, which is applied in the field of semiconductor storage media, can solve problems such as long scanning time, failure to successfully complete identification, and failure of flash media to support scanning, etc., to achieve accurate and fast scanning and management effects
Active Publication Date: 2013-11-06
NETAK TECH KO LTD
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Problems solved by technology
There are also a large number of good pages in the sub-chip flash memory media that can be used to store data, but the above-mentioned scanning method cannot successfully complete the identification, and the scanning takes a long time. It usually takes 2 hours or more to scan a flash memory media with a capacity of 1G. For a long time, scanning cannot be supported for larger capacity flash media
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[0024] The present invention proposes a first embodiment, which performs forward and backward successive approximation scans on at least one piece of the flash memory medium, respectively searches for good page intervals in at least one piece, and then obtains scanning results.
[0025] Firstly, the distribution of good pages and bad pages in a block of sub-shard flash media is analyzed, and it is found that good pages and bad pages of this kind of flash media are concentrated to form good page intervals and bad page intervals respectively.
[0026] refer to Figure 3 to Figure 8 The diagram showing the distribution of good and bad pages specifically includes the following situations: image 3 Show the case where all pages in the block are good pages; Figure 4 Show that all pages in the block are bad pages; Figure 5 It shows that both the front end and the back end of the block are bad pages, and the good pages are concentrated in the front position of the block; Figure ...
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The invention provides a scanning method for a flash memory medium, which aims at separately scanning at least one block of the flash memory medium on the front and back in a gradually approaching manner so as to seek out a space interval with good page in the at least one block, and then to obtain the scanning result. The invention also provides a management method for the flash memory medium. The scanning and management method for the flash memory medium can quickly and accurately scan the flash memory medium to obtain the information on the good and bad block and page, and to realize the management and use of the information on the block and the page. Especially, the flash memory medium with a defective plate can be scanned and managed quickly so as to provide convenience for reading and writing the flash memory medium with the defective plate.
Description
technical field [0001] The invention relates to the field of semiconductor storage media, in particular to a method for scanning and managing flash memory media. Background technique [0002] A flash memory medium (Flash) includes a plurality of storage blocks for short (Block, a basic unit of erasing a flash memory medium), and each block includes a plurality of pages (Page, a basic unit of reading and writing a flash memory medium). To identify whether flash media is usable, the blocks within it are scanned. The scanning process is as follows figure 1 As shown, the way to judge whether a certain block is a good block is to erase a certain block, then write data to each page of the block, and then read data from each page, and compare it with the written data. A page with the same data written in and read out is considered a usable page, referred to as a good page; otherwise, it is considered an unusable page, referred to as a bad page. A block where all pages are bad pa...
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IPC IPC(8): G11C29/32
Inventor 万红波
Owner NETAK TECH KO LTD