发明授权
US08019800B2 Access device, information recording device, information recording system, file management method, and program
有权
访问设备，信息记录设备，信息记录系统，文件管理方法和程序
- 专利标题： Access device, information recording device, information recording system, file management method, and program
- 专利标题（中）： 访问设备，信息记录设备，信息记录系统，文件管理方法和程序
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申请号： US12934334申请日： 2009-04-01
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公开(公告)号： US08019800B2公开(公告)日： 2011-09-13
- 发明人: Takuji Maeda , Shinji Inoue
- 申请人： Takuji Maeda , Shinji Inoue
- 申请人地址： JP Osaka
- 专利权人： Panasonic Corporation
- 当前专利权人： Panasonic Corporation
- 当前专利权人地址： JP Osaka
- 代理机构： Renner, Otto, Boisselle & Sklar, LLP
- 优先权： JP2008-097724 20080404
- 国际申请： PCT/JP2009/001535 WO 20090401
- 国际公布： WO2009/122743 WO 20091008
- 主分类号： G06F12/00
- IPC分类号： G06F12/00 ; G06F17/30
摘要：
An information recording device, which includes a nonvolatile memory whose areas are managed using an FAT file system and enhances the reliability of directory entries using a cyclic shift checksum, recalculates the cyclic shift checksum efficiently and performs seeking at a higher speed. A nonvolatile memory (25) of an information recording device 2 is managed using an FAT file system. In the memory, a plurality of directory entries are allocated to a single file. The device enhances the reliability of the directory entries using a cyclic shift checksum, and manages information indicating the position and the size of a storage area of file data using an extent information entry (203). The device further uses an update information entry (204) and a dummy entry (205).