Capacity expansion detection method of memory card and card reader with capacity expansion detection function

A detection method and memory card technology, applied in the field of memory cards, can solve problems such as 'Windows cannot complete formatting, freeze', value appreciation, etc.

CN104484634BInactive Publication Date: 2017-06-09UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-06-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a memory card capacity expansion detection method. Aiming at the current memory card capacity expansion method, comparison of sector memory capacity and register memory capacity, data writing and reading back of over-range addresses, and data writing of high-address range random addresses are adopted. A total of three-step detection of input and read-back is used to detect whether the memory card has been expanded. Only when the three-step detection is normal can it be judged as a normal memory card that has not been expanded, so as to realize accurate and effective expansion detection of the memory card. It also provides a card reader with expansion detection function to realize independent detection from the host, making expansion detection more convenient.
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Description

Technical field

[0001] The invention belongs to the technical field of memory cards, and more specifically, relates to a memory card expansion detection method and a card reader with expansion detection function. Background technique

[0002] Memory card expansion is a profit-making method often used by copycat memory card manufacturers, but there is currently a lack of independent devices on the market that specifically detect the quality of memory cards. Consumers can only use some software on the Windows operating system to identify the quality of memory cards. , The dependence on the operating system is strong, and the operation process is slow, which is easy to cause crashes; the test results can only be obtained after the memory card is purchased, and the test is of little significance. At present, most of the detection software on the market scans and detects in a certain increasing order. This gives some unscrupulous merchants the opportunity to use this increasing order ...

Examples

Embodiment

[0018] figure 1 It is a flowchart of a specific implementation manner of the method for detecting capacity expansion of a memory card of the present invention. Such as figure 1 As shown, the expansion detection method of the memory card of the present invention mainly adopts three-step detection, including the following steps:

[0019] S101: Read the DBR (DOS BOOT RECORD, partition boot sector) sector data of the memory card, get the total number of sectors, and get the memory capacity C of the memory card according to the total number of sectors 1 .

[0020] According to the specification of the FAT file system, if there is an MBR (Main Boot Record) in the memory card, the MBR data is stored in the lowest address space of the memory card, occupying 512 bytes of memory, which is the first sector; if The memory card has no MBR, so the first sector data is DBR. Therefore, first read the information of the first sector of the memory card by calling the single block read function SD_R...