Skip site navigation (1)Skip section navigation (2)
Date:      Sun, 29 Jul 2012 06:48:46 +0700
From:      Erich Dollansky <erichfreebsdlist@ovitrap.com>
To:        Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
Cc:        questions@freebsd.org, Vladimir Videscu <vladimir.videscu@gmail.com>
Subject:   Re: FreeBSD on SSD
Message-ID:  <20120729064846.3bc37892@AMD620.ovitrap.com>
In-Reply-To: <alpine.BSF.2.00.1207282016110.9859@wojtek.tensor.gdynia.pl>
References:  <CAMxhPyt-gF228nX0DNrdsFVXKVx6YjZVa7obfov5vf+dtV71zw@mail.gmail.com> <alpine.BSF.2.00.1207281229260.6801@wojtek.tensor.gdynia.pl> <CAKB6gVgEyvVYaUvLkvE_AU-aViJxHAiLu6drcodLjOOBeNEYLg@mail.gmail.com> <CAMxhPysfghi-0ufy0OU0nonqha5mFeRacPVXM0MBDe6fqxmjUg@mail.gmail.com> <alpine.BSF.2.00.1207282016110.9859@wojtek.tensor.gdynia.pl>

Next in thread | Previous in thread | Raw E-Mail | Index | Archive | Help
Hi,

On Sat, 28 Jul 2012 20:22:11 +0200 (CEST)
Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> wrote:

> the other thing is erasing data. You want to sell that drive and
> clear your data by
> 
> dd if=/dev/zero of=/dev/disk bs=1m
> 
> but does it clear SSD cache? i don't think so. Someone sophisticated 
> enough would perform raw read of cache chips and get cached data,
> which can actually be the most important part (things you work on
> often). _______________________________________________

You will have to read afterwards the same 8GB over and over again to
make the drive believe that you want to have these 8GB faster.

How to make sure that the data is really cached?

There is no way.

Erich



Want to link to this message? Use this URL: <http://docs.FreeBSD.org/cgi/mid.cgi?20120729064846.3bc37892>