Date: Fri, 26 Jul 2002 11:00:38 +0200 From: "Marco Berizzi" <pupilla@hotmail.com> To: dmp@pantherdragon.org Cc: hiten@uk.FreeBSD.org, freebsd-newbies@FreeBSD.ORG Subject: Re: block device vs char device Message-ID: <LAW2-F19PJlQb5cnKdi0001d232@hotmail.com>
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Thanks for the reply.
Now it's much more cleaner. So the correct
device to use is cd*a (or acd*a).
>From: Darren Pilgrim <dmp@pantherdragon.org>
>To: Marco Berizzi <pupilla@hotmail.com>
>CC: hiten@uk.FreeBSD.org, freebsd-newbies@FreeBSD.ORG
>Subject: Re: block device vs char device
>Date: Thu, 25 Jul 2002 17:04:18 -0700
>
>Marco Berizzi wrote:
> >
> > thanks for the patience.
> > I have read the man pages you have pointed me
> > before writing to the list but they don't
> > explain clearly the difference (at least for me).
> > Idem the handbook. Sometimes it reports you should
> > use cd0c (possibly) and some examples (take a look
> > at the SAP installation section) reports cd0a.
> >
> > Currently for me it is not clear why should I use
> > cd0c and not cd0a to mount a cdrom (or viceversa).
> > Both device are working well for me (this make me angry!!!).
> > I would like to know which is the difference between the
> > two nodes (the minors are different).
>
>cd0a and cd0c are different representations of the disc. Reading up on
>disklabel will give you some clues about this. The "a" and "c" are
>partition numbers, though "c" has special meaning. cd0a refers to the
>first ISO filesystem on the CD. cd0c refers to the entire disc. You
>should use cd0a for mounting a disc.
>
>There are also the audio-track device nodes: cd0t{1-100). These aren't
>created by default (MAKEDEV all). You can create them seperately by
>saying, `MAKEDEV cd0t`.
>
> > >From: Hiten Pandya <hitmaster2k@yahoo.com>
> > >--- Marco Berizzi <pupilla@hotmail.com> wrote:
> > > > Hi Hiten,
> > > >
> > > > Thanks for the reply about char & block devices.
> > > > Now all is much more clean.
> > >
> > >No Problem.
> > >
> > > > [ ... ]
> > > >
> > > > I haven't found anything about the difference
> > > > between cd0a & cd0c.
> > > > Any hints?
> > >
> > >OK. Ah my friend, it seems you didnt check the man pages (a very nice
> > >discovery :-). For information on 'cd' type devices, look at:
> > >
> > > 1) http://www.freebsd.org/cgi/man.cgi?query=cd&apropos=0&sektion=4
> > > -- This man page contains information about SCSI CDROM Devices.
> > >
> > > 2) http://www.freebsd.org/cgi/man.cgi?query=ata&apropos=0&sektion=4
> > > -- This man page contains information about ATAPI CDROM Devices.
> > >
> > >Hope this helps.
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