Date: Sun, 16 Jan 2022 09:26:48 +1100 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Arthur Chance <freebsd@qeng-ho.org> Cc: Christian Weisgerber <naddy@mips.inka.de>, freebsd-questions@freebsd.org Subject: Re: zero filling a storage device (was: dd and mbr) Message-ID: <20220115222648.GR61872@eureka.lemis.com> In-Reply-To: <523b6b6d-b17c-e632-a36a-a8c26ad61798@qeng-ho.org> References: <77680665-7ddb-23c5-e866-05d112339b60@holgerdanske.com> <20220114023002.GP61872@eureka.lemis.com> <YeDryNdYe1S20wd2@neutralgood.org> <YeGXejPepsd4aKiE@lorvorc.mips.inka.de> <523b6b6d-b17c-e632-a36a-a8c26ad61798@qeng-ho.org>
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--cYG5ZC/RuVsIq1ir Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Friday, 14 January 2022 at 17:14:18 +0000, Arthur Chance wrote: > On 14/01/2022 15:32, Christian Weisgerber wrote: >> "Kevin P. Neal": >> >> I'll note that there are SSDs that compress the data written to >> them. (Compression in storage devices isn't new. Terry Welch's >> 1984 paper, where he presented the LZW compression algorithm, already >> talks about this.) > > May I suggest "man trim"? (From 12.1 onwards.) Yes, but if you also read the man page, you'll see that it's a very blunt instrument. It certainly doesn't identify blocks with a specific data pattern and optimize them out. Greg -- Sent from my desktop computer. See complete headers for address and phone numbers. This message is digitally signed. If your Microsoft mail program reports problems, please read http://lemis.com/broken-MUA.php --cYG5ZC/RuVsIq1ir Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iEYEARECAAYFAmHjSigACgkQIubykFB6QiMuuACfQUfRCDLzWZtICWSXxNoPc6kB AIgAoJNHQTx2g+9YrGHYcglqHuflH6Tt =GcaX -----END PGP SIGNATURE----- --cYG5ZC/RuVsIq1ir--
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