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Information recording medium, information recording medium accessing apparatus and accessing method
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A technology of information recording and media, which is applied to recording carriers used in machines, instruments, and electrical digital data processing. It can solve problems such as inability to write at high speed, and achieve the effect of high-speed access speed.
Active Publication Date: 2009-03-11
PANASONIC CORP
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[0016] However, in the above-mentioned method, when storing relatively large-sized file data in the data area, high-speed writing can be performed, which is very effective, but for small-sized data such as file system management information, high-speed writing cannot be performed. input, it has no effect
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Embodiment approach 1
[0058] (Structure of semiconductor memory card and access device)
[0059] FIG. 1 is a diagram showing a configuration example of a semiconductor memory card and an access device related to the present invention. As shown in FIG. 1 , the access device 100 has a CPU 101 , a RAM 102 , a slot 103 , and a ROM 104 .
[0060] Programs 105 to 107 for controlling the access device 100 are stored in the ROM 104 , the programs are executed by the CPU 101 using the RAM 102 as a temporary storage area, and provide predetermined functions. Specifically, ROM 104 includes application programs 105 , file system control programs 106 , and access control programs 107 .
[0061] The application program 105, the file system control program 106, and the access control program 107 control the entire access device 100, control the file system built in the semiconductor memory card 110, and write and read data to and from the semiconductor memory card 110, respectively. Access control.
[0062] Sp...
Embodiment approach 2
[0133] The semiconductor memory card according to Embodiment 1 has two semiconductor memories having different optimal access units, and stores file data and file system management information in different semiconductor memories, respectively. In contrast, the semiconductor memory card of this embodiment divides the recording area of one semiconductor memory into two areas, makes the access unit (management method) of each area different, and stores file data and file system management information in different in the area. Such a configuration also achieves an increase in access speed as in the first embodiment.
[0134] (Semiconductor memory card and access device configuration)
[0135]FIG. 12 is a diagram showing the configuration of a semiconductor memory card and an access device in this embodiment. In addition, in FIG. 12 , the same constituent elements as those shown in FIG. 1 perform the same operations as those in Embodiment 1, and realize the same functions.
[...
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Abstract
An information recording medium (110), such as a semiconductor memory card, comprises a first semiconductor memory (118) that is accessed in relatively small access units and that has a first recording area (121) in which file system management information is stored; a second semiconductor memory (119) that is accessed in relatively large access units and that has a second recording area (122) in which file data (entity data of files) are stored; and control means (112) for controlling the first and second semiconductor memories. During data write operation, the information recording medium (110) selects one of the recording areas of the first and second semiconductor memories (118,119) according to the data type, and writes data into the selected recording area.
Description
technical field [0001] The present invention relates to an information recording medium capable of writing and reading data by an external device, in particular to an information recording medium managing stored data through a file system and an access device for accessing the information recording medium. Background technique [0002] There are various types of recording media for recording digital data such as music content and video data, such as magnetic disks, optical disks, and magneto-optical disks. Semiconductor memory cards, one of these recording media, mainly use non-volatile semiconductor memories such as flash ROM as storage elements, and because of the miniaturization of recording media, they are rapidly spreading mainly in small portable devices such as digital cameras and mobile phone terminals. stand up. [0003] The data stored in the semiconductor memory card is managed by a file system, and the user can easily handle the stored data as a file. File syst...
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