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| From | "Carlos E.R." <robin_listas@invalid.es> |
| Newsgroups | comp.os.linux.misc |
| Subject | Re: Is there a good "dd for dummies" tutorial around? |
| Date | Mon, 22 Feb 2016 04:39:40 +0100 |
| Organization | Netfront http://www.netfront.net/ |
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On 2016-02-22 02:59, Carlos E. R. wrote: > On 2016-02-20 19:04, pureheart@pacbell.net wrote: >> This is probably considered basic stuff but I'm still having trouble understanding dd. >> >> In particular, why do the things it writes/reads to have to be *un*mounted? > > They don't. It depends on what you want to do. To clarify. dd if=/tmp/somefile of=/tmp/someotherfile needs the filesystem be mounted. while: dd if=/dev/sdb1 of=/tmp/imageofsdb1 can run while sdb1 is mounted, but the resulting image will be "dirty"; ie, it will at need an fsck before being used. And if something changes in the mounted sdb1 while the copy runs, the resulting image will be inconsistent. This one: dd if=/tmp/imageofsdb1 of=/dev/sdb1 might (at worst) provoke a crash of some kind if sdb1 is mounted while you write to it this way. None of that is specific to 'dd', but to copy and filesystem operations, regardless of whatever tool you use. In fact, all those operations can be done with a plain "cp", ie, the copy file program. -- Cheers, Carlos. --- news://freenews.netfront.net/ - complaints: news@netfront.net ---
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Is there a good "dd for dummies" tutorial around? pureheart@pacbell.net - 2016-02-20 10:04 -0800
Re: Is there a good "dd for dummies" tutorial around? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2016-02-20 20:24 +0200
Re: Is there a good "dd for dummies" tutorial around? William Unruh <unruh@invalid.ca> - 2016-02-20 18:26 +0000
Re: Is there a good "dd for dummies" tutorial around? Robert Heller <heller@deepsoft.com> - 2016-02-20 12:40 -0600
Re: Is there a good "dd for dummies" tutorial around? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2016-02-20 14:10 -0500
Re: Is there a good "dd for dummies" tutorial around? "Carlos E. R." <robin_listas@invalid.es> - 2016-02-22 02:59 +0100
Re: Is there a good "dd for dummies" tutorial around? "Carlos E.R." <robin_listas@invalid.es> - 2016-02-22 04:39 +0100
Re: Is there a good "dd for dummies" tutorial around? pureheart@pacbell.net - 2016-02-24 15:55 -0800
Re: Is there a good "dd for dummies" tutorial around? "Carlos E. R." <robin_listas@invalid.es> - 2016-02-26 03:39 +0100
Re: Is there a good "dd for dummies" tutorial around? pureheart@pacbell.net - 2016-02-29 18:05 -0800
Re: Is there a good "dd for dummies" tutorial around? The Natural Philosopher <tnp@invalid.invalid> - 2016-03-01 02:45 +0000
Re: Is there a good "dd for dummies" tutorial around? "Carlos E.R." <robin_listas@invalid.es> - 2016-03-01 11:14 +0100
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