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Groups > comp.os.linux.hardware > #3071

Re: drive terms -- Re: What is happening to the disk

From Henrik Carlqvist <Henrik.Carlqvist@deadspam.com>
Newsgroups comp.os.linux.hardware
Subject Re: drive terms -- Re: What is happening to the disk
Date 2016-05-23 05:30 +0000
Organization A noiseless patient Spider
Message-ID <nhu4hp$57m$1@dont-email.me> (permalink)
References <2601393.pgnaPWHiXO@Dharma> <3f39c378-03da-4cf6-b6ac-51dfb7702cbc@googlegroups.com> <nhqjh9$ule$1@posie.signal11.org.uk> <KaydnZgbd9Ormd_KnZ2dnUU7-e2dnZ2d@earthlink.com>

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On Sun, 22 May 2016 14:10:46 -0500, Ant wrote:
>> The "sr"== removable media. Sounds like a DVD drive ...
> 
> Thanks. That's news to me even though I have been using Linux for many
> years.
> 
> Is there a list of these meanings?

That list is in /usr/src/linux/Documentation/devices.txt
 
> I found
> http://superuser.com/questions/272657/whats-the-difference-between-dev-
hdc-dev-sr0-dev-cdrom
> but it seems to be outdated since it says "/dev/sr0 is a device on the
> scsi controller." :(

When it comes to /dev/sd* it is rather good explained at 
http://superuser.com/questions/558156/what-does-dev-sda-for-linux-mean

-8<--------------------------------
sd originally identified a SCSI device, but since the wildgrowth of USB 
(and other removable) data carriers it became a catch-all for any block 
device (another unix term; in this context, anything capable of carrying 
data) that wasn't already accessible via IDE. When SATA came around, the 
developers figured it'd be much easier and much more convenient for 
everyone to add it into the existing framework rather than write a whole 
new framework.
-8<--------------------------------

But when it comes to /dev/sr* I would rather say that it really is some 
kind of SCSI drive. Those ATAPI cdroms take SCSI commands on the ATA 
interface.

So it all sums up with that you might be able to find your IDE cdrom, 
your SATA HD and even some USB drive listed in /proc/scsi/scsi.

regards Henrik
-- 
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Thread

What is happening to the disk Peter Terpstra <peter.terpstra7@gmail.com> - 2016-05-20 09:25 -0700
  Re: What is happening to the disk andrew.williams@t-online.de - 2016-05-20 23:50 -0700
    Re: What is happening to the disk mjb@signal11.invalid (Mike) - 2016-05-21 22:21 +0100
      drive terms -- Re: What is happening to the disk ANTant@zimage.com (Ant) - 2016-05-22 14:10 -0500
        Re: drive terms -- Re: What is happening to the disk Henrik Carlqvist <Henrik.Carlqvist@deadspam.com> - 2016-05-23 05:30 +0000
          Re: drive terms -- Re: What is happening to the disk ANTant@zimage.com (Ant) - 2016-05-23 20:00 -0500
            Re: drive terms -- Re: What is happening to the disk Henrik Carlqvist <Henrik.Carlqvist@deadspam.com> - 2016-05-24 06:28 +0000

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