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%2BdtV71zw@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>
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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
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