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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakuji Maeda, Teruto Hirota
Estimating the term…
A predetermined number of erasable blocks positioned at a start of a volume area in a semiconductor memory card are provided so as to include volume management information. A user area following the volume management information includes a plurality of clusters. A data length NOM of an area from a master boot record & partition table sector to a partition boot sector is determined so that the plurality of clusters in the user area are not arranged so as to straddle erasable block boundaries. Since cluster boundaries and erasable block boundaries in the user area are aligned, there is no need to perform wasteful processing in which two erasable blocks are erased to rewrite one cluster.
An access apparatus for performing file access on a semiconductor memory device that has a memory area comprising of a plurality of sectors, by managing one or more sectors as a cluster, and managing one or more clusters as a file, some consecutive sectors in the memory area forming a block, a block being a smallest unit on which data erasure can be performed, the block size being a power of 2 of the cluster size, the access apparatus comprising:
A semiconductor memory device that has a memory area comprising of a plurality of sectors, by managing one or more sectors as a cluster, and managing one or more clusters as a file, some consecutive sectors in the memory area forming a block, a block being a smallest unit on which data erasure can be performed, the block size being a power of 2 of the cluster size, the semiconductor memory device comprising:
A semiconductor memory device having a memory area that includes (1) a protected area that can only be accessed by a device connected to the semiconductor memory device once an authenticity of the connected device has been verified, and (2) a user data area that can be accessed by the connected device regardless of whether or not the authenticity of the connected device has been verified, the protected area and the user data area including a plurality of sectors, and managing one or more sectors as a cluster, and one or more clusters as a file, some consecutive sectors forming a block, a block being a smallest unit on which data erasure can be performed, the block size being a power of 2 of the cluster size, and at least one of the protected area and the user data area including:
An initialization method for initializing a computer to perform file access on a semiconductor memory device that has a memory area comprising of a plurality of sectors, by managing one or more sectors as a cluster, and managing one or more clusters as a file, some consecutive sectors in the memory area forming a block, a block being a smallest unit on which data erasure can be performed, the block size being a power of 2 of the cluster size, the initialization method comprising the steps of:
A recording medium storing a program in a computer-readable format for causing a computer to perform file access on a semiconductor memory device that has a memory area comprising of a plurality of sectors, by managing one or more sectors as a cluster, and managing one or more clusters as a file, some consecutive sectors in the memory area forming a block, a block being a smallest unit on which data erasure can be performed, the block size being a power of 2 of the cluster size, the recording medium having the computer perform the following steps of:
Dependencies are inferred from the claim text.