Groups | Search | Server Info | Login | Register
Groups > comp.os.linux.misc > #16811
| From | Tauno Voipio <tauno.voipio@notused.fi.invalid> |
|---|---|
| Newsgroups | comp.os.linux.misc |
| Subject | Re: Is there a good "dd for dummies" tutorial around? |
| Date | 2016-02-20 20:24 +0200 |
| Organization | A noiseless patient Spider |
| Message-ID | <naaarc$lpk$1@dont-email.me> (permalink) |
| References | <9be980ce-21a2-4d14-bfb4-ad96dcd9a5a5@googlegroups.com> |
On 20.2.16 20:04, 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? > > How does the system even know that the device exists if it's not mounted? > > What happens if you *do* write to a mounted device. > > So far I've read about six dd how-tos, but I have not had the mounting explained to my feeble mind's satisfaction. > > Anyone have a good url or simple explanation? > > Pureheart in Aptos > Actually, this is a question of copying filesystem images. dd is the tool often used for it, but the considerations apply to other methods of copying, as well. If a filesystem image is mounted, the filesystem handler may be changing its contents, and it relies on the image staying intact from other writers. The unmount requirement applies to all filesystem images, be they disk partitions or loopback mount files. In modern Linux distributions there is a pseudo-filesystem /proc, which is a peekhole into kernel internals. You'll see all disk partitions known to the kernel by reading /proc/partitions: cat /proc/partitions -- -TV
Back to comp.os.linux.misc | Previous | Next — Previous in thread | Next in thread | Find similar
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
csiph-web