Linux flash file methods

The earliest flash file system was the True Flash File System (TrueFFS) from Israel-based M-Systems. The first flash-specific file system for NOR flash reminiscence gadgets on Linux was the Journaling Flash File System (JFFS). JFFS2, which changed JFFS and added help for NAND flash, has been used since 2001.

There are quite a few potential replacements for JFFS2:

• Yet Another Flash File System. Yaffs1 and Yaffs2 help NAND flash chips.
• Unsorted Block Image File System. UBIFS helps write caching and shop indexes in flash.
• LogFS. This Linux-based flash-specific file system is beneath growth to handle JFFS2 scalability points.
• Flash-Friendly File System. F2FS is to be used on flash-based storage gadgets with a flash translation layer, which is a part of the solid-state drive (SSD) controller that maps logical block addresses from the host to the bodily block addresses on the drive.

Pros and cons of flash file methods

Flash file methods are usually used just for MTDs, which are embedded flash reminiscences that lack a controller. An MTD supplies particular details about a flash machine, similar to machine sort, buffer dimension, and block and partition dimension.

Flash file methods are designed to unfold writes out as evenly as potential to extend the lifespan of a flash machine. A flash file system can guarantee a flash-based design makes use of the entire capabilities of the flash machine as effectively as potential.

A flash file system can’t be accessed by finish customers. It is constructed into the firmware and is utilized by the flash controller to handle program/erase cycles on the flash media. Flash file methods, similar to a NAND flash file system, are usually proprietary and particular to particular person controllers.