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Date: Thu, 7 Dec 2023 18:04:52 +0100
To: cygwin AT cygwin DOT com
Subject: Re: getVolInfo question
Message-ID: <ZXH7NKbZXz3Mr3DG@calimero.vinschen.de>
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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On Dec  7 15:35, Lavrentiev, Anton (NIH/NLM/NCBI) [C] via Cygwin wrote:
> Hi Corinna,
> 
> I have a question about this tool getVolInfo that has recently "made the news".
> 
> Just updated my version to the latest and tried it on my drive C:, and specifically this is what bugs me:
> 
> $ /usr/lib/csih/getVolInfo.exe .
> ...
> SectorInfoFlags    : 0x03
>   SSINFO_FLAGS_NO_SEEK_PENALTY      : FALSE
>   SSINFO_FLAGS_TRIM_ENABLED         : FALSE
> 
> I presume the values shown are described here:
> https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-fscc/3e75d97f-1d0b-4e47-b435-73c513837a57
> 
> But my drive (well, all NTFS) does have TRIM enabled:
> 
> $ fsutil behavior query disabledeletenotify
> DisableDeleteNotify = 0
> 
> Which is also confirmed by other tools... (like SSD "dashboards" etc.)

Yes, but!

fsutil behavior query disabledeletenotify *only* shows if the OS
supports disabledeletenotify, i.e., TRIM, on a system-wide base(*).
It does *not* tell you if TRIM is really enabled on an existing
filesystem on any of your drives.

TRIM is only enabled on a filesystem, if the underlying drive
actually supports TRIM.  The majority of SSDs support it, but not
necessarily all SSDs.

The above values, in particular SSINFO_FLAGS_NO_SEEK_PENALTY being
FALSE, indicate that your drive is actually not an SSD, but a rotating
harddisk, or it's an SSD which fakes to be a rotating harddisk.

I have a laptop with a Samsung 830 SSD, and getVolInfo prints:

  SectorInfoFlags    : 0x0f
    SSINFO_FLAGS_NO_SEEK_PENALTY      : TRUE
    SSINFO_FLAGS_TRIM_ENABLED         : TRUE

I'm running a with NTFS and ReFS on virtual filebacked drives,
the ReFS actually spanning two virtual drives.

csih prints

  SectorInfoFlags    : 0x0b
    SSINFO_FLAGS_NO_SEEK_PENALTY      : FALSE
    SSINFO_FLAGS_TRIM_ENABLED         : TRUE

for the NTFS FS, and

  SectorInfoFlags    : 0x03
    SSINFO_FLAGS_NO_SEEK_PENALTY      : FALSE
    SSINFO_FLAGS_TRIM_ENABLED         : FALSE

for the ReFS FS.


Corinna

(*) FWIW, on Windows 11, this is even split into two values for NTFS
    and ReFS separately.

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