| 词条 | Flash translation layer |
| 释义 |
}}{{merge|Flash memory controller|date=August 2018}} Some subsystems are often called flash file systems, while they are more precisely block drivers performing different translations, and they actually do not have a file system interface. Such subsystems include the following: TrueFFSDespite the name, TrueFFS is not a file system at all; it does not provide a file system interface but a disk interface. TrueFFS is correctly termed a flash translation layer. True flash file system or TrueFFS is designed to run on a raw solid-state drive (most modern consumer SSDs are not raw). TrueFFS implements error correction, bad block re-mapping and wear leveling. Externally, TrueFFS presents a normal hard disk interface. TrueFFS was created by M-Systems[1] on the well-known "DiskOnChip 2000" product line. A derivative of TrueFFS, called TFFS or TFFS-lite, is found in the VxWorks operating system, where it functions as a flash translation layer, not as a fully functional file system. A flash translation layer is used to adapt a fully functional file system to the constraints and restrictions imposed by flash memory devices. M-Systems was acquired by SanDisk in 2006. ExtremeFFSExtremeFFS is a technology developed by SanDisk (which acquired M-Systems) allowing for improved random write performance in flash memory compared to TrueFFS. Sandisk claimed that the technology improves random access speed in Solid-state drives by a factor of 100.[2][3] In 2008 the company promoted using ExtremeFFS in a multi-level cell implementation of NAND flash memory.[4]See also
References1. ^{{cite patent |country=US |number=5404485 |status=patent |title=Flash file system, Amir Ban}} {{desktop-environment-stub}}2. ^{{cite news |author= Tony Smith |work= The Register |title=SanDisk pitches 100x SSD speed boost tech: Slow random writes hidden in fast sequential writes |date= November 5, 2008 |url= https://www.theregister.co.uk/2008/11/05/sandisk_soups_up_ssds/ |accessdate= October 23, 2016 }} 3. ^{{cite web |title= SanDisk Technical Expertise and Metrics |publisher= Sandisk |work= Promotional web site |url= http://www.sandisk.com/OEM/ProductCatalog(1425)-SanDisk_Technical_Expertise_and_Metrics.aspx |deadurl= yes |archiveurl= https://web.archive.org/web/20081108042926/http://www.sandisk.com/OEM/ProductCatalog(1425)-SanDisk_Technical_Expertise_and_Metrics.aspx |archivedate= November 8, 2008 |accessdate= October 23, 2016 }} 4. ^{{cite news |author= Chris Mellor |work= The Register |title=SanDisk flash holds secret flash sauce till after Christmas |date= November 28, 2008 |url= https://www.theregister.co.uk/2008/11/28/sandisk_3xmlc_nand_technology/ |accessdate= October 23, 2016 }} 1 : Desktop environments |
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