2 results about "File allocation table" patented technology

The invention relates to a domestic ARM chip-based inertial navigation high-frequency data long-term storage method, which comprises the following steps of: periodically judging a DMA (Direct Memory Access) double-buffer channel data receiving mark in real time in a highest priority data storage task of a system by configuring and transplanting an exFAT (Extensible File Allocation Table) file system and a FreeRTOS (Real-time Operating System); writing the received inertial navigation high-frequency data into a file in the SD card configured to be in an exFAT format, and if the mark is invalid, releasing CPU resources by the storage task to wait for entering next time; meanwhile, redundant operation is provided, the write-in return state of the data file of the SD card is judged in real time, if the write-in is not successful, the write-in operation is repeated for multiple times until the write-in is successful, and the task is quitted, so that the risk of data storage loss is reduced. According to the invention, the 24-hour data volume under the frequency of 1000Hz is greater than 4GB, the continuous storage time is greater than 2000 hours, and all data are completely stored in the SD card, so that the method is suitable for the long-term storage requirement of the inertial navigation field on high-frequency data, and the application and development of the localization technology in high-frequency data processing are promoted.

The application discloses a kind of disk data management method, recovery method, device, equipment and medium, comprising: when target disk is set to offline state, create bitmap file, when updating operation is performed to target file, determine the disk and storage address where the data block to be updated is stored according to file allocation table, according to the storage address of target data block to be updated, the data state of target data block to be updated in bitmap file is marked as to be updated state.In the online recovery of target disk, determine target data block according to file allocation table, determine data state according to the storage address of target data block, in combination with bitmap file, if it is to be updated state, then update target data block according to target copy, clear the mark of to be updated state of target data block in bitmap file, until all marks are cleared, set target disk to online state.Shorten the time of offline disk online, reduce the IO load of offline disk online.