Trim (computing) | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-01-06

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Trim_(computing)


00:01:27 1 Flash drive specific issues
00:04:26 2 Operation
00:05:46 3 Implementation
00:05:55 3.1 Operating system support
00:06:34 3.2 RAID issues
00:06:58 3.2.1 Windows
00:07:17 3.2.2 Mac OS
00:07:54 3.2.3 Linux
00:11:34 3.3 Enabling unsupported filesystems
00:12:16 4 Hardware support
00:12:26 4.1 ATA
00:15:26 4.2 SCSI
00:15:46 4.3 SD/MMC
00:16:25 4.4 NVM Express
00:16:58 5 Shortcomings
00:20:31 6 See also



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SUMMARY
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A trim command (known as TRIM in the ATA command set, and UNMAP in the SCSI command set) allows an operating system to inform a solid-state drive (SSD) which blocks of data are no longer considered in use and can be wiped internally.Trim was introduced soon after SSDs were introduced. Because low-level operation of SSDs differs significantly from hard drives, the typical way in which operating systems handle operations like deletes and formats resulted in unanticipated progressive performance degradation of write operations on SSDs. Trimming enables the SSD to more efficiently handle garbage collection, which would otherwise slow future write operations to the involved blocks.Although tools to "reset" some drives to a fresh state were already available before the introduction of trimming, they also delete all data on the drive, which makes them impractical to use for ongoing optimization. By 2014, many SSDs had internal background garbage collection mechanisms that worked independently of trimming. Although this successfully maintained their performance even under operating systems that did not support trim, it had the associated drawbacks of increased write amplification and wear of the flash cells.