Gentoo Archives: gentoo-user

From: David Haller <gentoo@×××××××.de>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Seagate ST8000NM0065 PMR or SMR plus NAS SAS SATA question
Date: Sat, 23 May 2020 15:39:58
Message-Id: 20200523153625.ubqae74xszpzxg5m@grusum.endjinn.de
In Reply to: Re: [gentoo-user] Seagate ST8000NM0065 PMR or SMR plus NAS SAS SATA question by antlists
Hello,

On Fri, 22 May 2020, antlists wrote:
>On 22/05/2020 19:23, Rich Freeman wrote: >> A big problem with drive-managed SMR is that it basically has to >> assume the OS is dumb, which means most writes are in-place with no >> trims, assuming the drive even supports trim. > >I think the problem with the current WD Reds is, in part, that the ATA-4 spec >is required to support trim, but the ATA-3 spec is the current version. >Whoops ...
ATA-8 is the current spec. Though practically unused. The used spec is ATA-7 in virtually all drives for IIRC the last 10ish years or so. Did you mean SATA specs? Well, then there's only SATA-1 (1.5GBit/s), SATA-2, (3.0GBit/s) and SATA-3 (6.0GBit/s), and of the latter SATA revision 3.1 introduced TRIM[2]. Oh, and rev. 3.3 introduced some extras for SMR [3]. HTH, -dnh [1] https://en.wikipedia.org/wiki/Parallel_ATA [2] https://en.wikipedia.org/wiki/Serial_ATA#SATA_revision_3.0_(6_Gbit/s,_600_MB/s,_Serial_ATA-600) [3] https://en.wikipedia.org/wiki/Serial_ATA#SATA_revision_3.3 -- The nice thing about Windows is - It does not just crash, it displays a dialog box and lets you press 'OK' first. (Arno Schaefer's .sig)

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