Patent application number | Description | Published |
20090287874 | Flash Recovery Employing Transaction Log - A transaction log for flash recovery includes a chained sequence of blocks specifying the operations that have been performed, such as a write to a sector or an erase to a block. Checkpoints are performed writing the entire flash state to flash. Once a checkpoint is performed, all of the log entries prior to the checkpoint are deleted and the log processing on recovery begins with the latest checkpoint. If the system is able to safely shutdown, then a checkpoint may be performed before the driver unloads, and on initialization, the entire persisted flash state may be loaded into the flash memory with a minimal amount of flash scanning. If a power failure occurs during system operation, then on the next boot-up, only the sectors or blocks specified in the log entries after the latest checkpoint have to be scanned, rather than all the sectors on the part. | 11-19-2009 |
20100049776 | FAT DIRECTORY STRUCTURE FOR USE IN TRANSACTION SAFE FILE - Directories in a file system are defined with a dummy cluster in a file allocation table as the initial entry. Subsequent clusters in a directory's definition may define any data for the directory that can be changed in a transaction-safe mode. A directory may be modified in a transaction-safe mode by modifying any of the subsequent clusters while tracking changes in a second file allocation table. When the changes have been made to the directory, a pointer to the second file allocation table may be switched to indicate that the second file allocation table is now last known good. The first file allocation table may then be synchronized with the second. | 02-25-2010 |
20100217788 | STORAGE SYSTEM FORMAT FOR TRANSACTION SAFE FILE SYSTEM - A transaction safe file system uses two sets of file allocation tables and bitmap images to perform file modifications on one of the sets while the other set remains a last known good set. After a modification is complete, a pointer is changed to the newly modified set, and the newly modified set becomes the last known good set. The sets are then synchronized. The file allocation table is used to define cluster chains while the bitmap image is used to determine if a cluster is free or not. In some operations, only the bitmap image may need to be manipulated. The file system may be used in a transaction safe mode as well as a non-transaction safe mode. | 08-26-2010 |
20110302142 | STORAGE SYSTEM FORMAT FOR TRANSACTION SAFE FILE SYSTEM - A transaction safe file system uses two sets of file allocation tables and bitmap images to perform file modifications on one of the sets while the other set remains a last known good set. After a modification is complete, a pointer is changed to the newly modified set, and the newly modified set becomes the last known good set. The sets are then synchronized. The file allocation table is used to define cluster chains while the bitmap image is used to determine if a cluster is free or not. In some operations, only the bitmap image may need to be manipulated. The file system may be used in a transaction safe mode as well as a non-transaction safe mode. | 12-08-2011 |
20120011177 | TRANSACTION-SAFE FAT FILE SYSTEM IMPROVEMENTS - Concepts for enhancing operation of transaction-safe file allocation table systems are described. The concepts include writing a file to non-volatile memory media and rendering an update of file size to the TFAT storage medium; and receiving a request to locate data in a non-volatile memory having a TFAT file management system, selecting a sector of the memory to parse to locate the data, determining when the selected sector is a first sector of a directory or subdirectory of the memory and when determining reveals that the selected sector is a first sector, skipping reading data from the selected sector. The concepts also include flushing a cache and synchronizing FATs. | 01-12-2012 |
20120011179 | FAT DIRECTORY STRUCTURE FOR USE IN TRANSACTION SAFE FILE SYSTEM - Directories in a file system are defined with a dummy cluster in a file allocation table as the initial entry. Subsequent clusters in a directory's definition may define any data for the directory that can be changed in a transaction-safe mode. A directory may be modified in a transaction-safe mode by modifying any of the subsequent clusters while tracking changes in a second file allocation table. When the changes have been made to the directory, a pointer to the second file allocation table may be switched to indicate that the second file allocation table is now last known good. The first file allocation table may then be synchronized with the second. | 01-12-2012 |
20130318136 | FAT DIRECTORY STRUCTURE FOR USE IN TRANSACTION SAFE FILE SYSTEM - Directories in a file system are defined with a dummy cluster in a file allocation table as the initial entry. Subsequent clusters in a directory's definition may define any data for the directory that can be changed in a transaction-safe mode. A directory may be modified in a transaction-safe mode by modifying any of the subsequent clusters while tracking changes in a second file allocation table. When the changes have been made to the directory, a pointer to the second file allocation table may be switched to indicate that the second file allocation table is now last known good. The first file allocation table may then be synchronized with the second. | 11-28-2013 |
20140279877 | Transaction-Safe Fat File System Improvements - Concepts for enhancing operation of transaction-safe file allocation table systems are described. The concepts include writing a file to non-volatile memory media and rendering an update of file size to the TFAT storage medium; and receiving a request to locate data in a non-volatile memory having a TFAT file management system, selecting a sector of the memory to parse to locate the data, determining when the selected sector is a first sector of a directory or subdirectory of the memory and when determining reveals that the selected sector is a first sector, skipping reading data from the selected sector. The concepts also include flushing a cache and synchronizing FATs. | 09-18-2014 |