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TFS4™
SAMSUNG TFS4 (Transactional File System 4) is an embedded flash file system that uses SAMSUNG NAND flash memory as storage on any consumer electronic devices. It includes a FTL that makes NAND flash emulate a normal hard disk drive, and so it enables optimized data management as well as file management to SAMSUNG NAND flash memory.
The following application notes for TFS4 provide answers to frequently asked questions about TFS4 file system. It will help you to understand methodology for working with TFS4 file system and also contains the description of the features and functions of the TFS4 file system.
TFS4 1.6 Contiguous Cluster
- This paper explains the SAMSUNG's TFS4 FAT allocation policy to reduce fragmentation and improve the file system performance by building 'free cluster map' to detect contiguous locations and reclaiming all deallocated clusters to form contiguous locations.
TFS4 1.6 Directory Entry Cache
- This paper explains SAMSUNG's small size directory entry cache to improve the file system performance and lookup time.
TFS4 1.6 Fast Seek Access
- This Paper explains the SAMSUNG's TFS4 file system operation to improve the performance to fast access the target position for read and write operation.
TFS4 1.6 Fast Unlink
- This Paper explains the SAMSUNG's TFS4 FAT file system operation for effectively deleting a file without accessing the whole FAT entries on the FAT table.
TFS4 1.6 Mount Operation
- This paper explains the TFS4 mounting function and how the mount operation is executed by the SAMSUNG's TFS4 flash file system. It also explains what happens internally when the mount operation is executed.
TFS4 1.6 Hidden Protected Area
- This paper presents an overview and an in-depth description of the new hidden protected area (HPA) based on internal NAND solution. The hidden protected area, enables SAMSUNG to provide a recovery solution that provides greater flexibility and that enhances the security for recovery data.
TFS4 1.6 Buffer Cache
- This paper focuses on SAMSUNG's Buffer Cache Management in TFS4 to reduce direct device read/write operations, and thus improve file system performance.
- Buffer Cache Management caches device data, and try to let device read/write operations carry out on cache instead of on disk and managing data transfer between a device drive and a cache buffer.
TFS4 1.6 Power-Off Recovery
- This paper describes about the Log manager features in the SAMSUNG's TFS4 FAT based file system where the transactions are performed in an atomic way in order to prevent the data corruption and maintain consistency of file system.
