Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!nntp.club.cc.cmu.edu!micro-heart-of-gold.mit.edu!bloom-beacon.mit.edu!bloom-beacon.mit.edu!panix!MIX!Blackbird From: billy@MIX.COM Newsgroups: comp.sys.mac.system Subject: Re: SSD in Older MB Pro? Date: Fri, 23 May 2014 12:07:04 +0000 (UTC) Organization: PANIX Public Access Internet and UNIX, NYC Lines: 30 Message-ID: References: <220520141922071255%star@sky.net> <1lm3ng6.1hgq6we12ms8rdN%dempson@actrix.gen.nz> NNTP-Posting-Host: panix5.panix.com X-Trace: reader2.panix.com 1400846824 22264 166.84.1.5 (23 May 2014 12:07:04 GMT) X-Complaints-To: abuse@panix.com NNTP-Posting-Date: Fri, 23 May 2014 12:07:04 +0000 (UTC) Xref: csiph.com comp.sys.mac.system:59644 Lewis writes, quoting me: > > Those using the SandForce controller won't benefit > > much from it. Others, like Crucial (Marvell) and > > Samsung will. > > That was true several years ago, but I am pretty sure I read something > about the current (SATA-III era) SSDs simply not needing TRIM. > > I could be mistaken. None of them really needs it, but every little bit of wear reduction helps. TRIM is a SATA-only (and perhaps PCI) command. So Firewire, USB, etc, disks have to live without it. SandForce compresses data and that reduces wear for users with compressible stuff (probably most people). More into is here - http://www.lsi.com/company/technology/duraclass/pages/durawrite.aspx Data Compression in the Intel Solid-State Drive 520 Series http://preview.tinyurl.com/ow7274m http://blog.lsi.com/did-you-know-hdds-do-not-have-a-delete-command-that-is-why-ssds-need-trim/ http://blog.lsi.com/can-data-reduction-technology-substitute-for-trim-in-an-ssd-and-drain-the-invalid-data-away/ Billy Y.. -- sub #'9+1 ,r0 ; convert ascii byte add #9.+1 ,r0 ; to an integer bcc 20$ ; not a number