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CC: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
Subject: RE: [EXTERNAL] Re: getVolInfo question
Thread-Topic: [EXTERNAL] Re: getVolInfo question
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From: "Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\] via Cygwin" <cygwin AT cygwin DOT com>
Reply-To: "Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\]" <lavr AT ncbi DOT nlm DOT nih DOT gov>
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Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

Thank you for your prompt reply!

> 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.

Well, I don't have any rotating HHDs in my computer.  4 of my SSDs report this:

TRIM Command:  Supported (Deterministic Read After TRIM, Words = 0)

and the last one (an older drive, indeed) report this:

TRIM Command:  Supported (Indeterminate Read After TRIM)

But my C: drive (where Cygwin is installed) is a newer drive (one of those 4).

That's odd.

Also, the fact that I am unable to restore any files after deletion (all contents become
0), just experimenally supports the fact that the drives do trim the deleted sectors.

(And no, I do not have any secure deletion or anything like that enabled; when this PC had
HDDs in the past, the files were perfectly recoverable.)

Anton Lavrentiev
Contractor NIH/NLM/NCBI


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