[Gllug] Debian file system

[Pete Ryland]

On Mon, May 03, 2004 at 09:00:49PM +0100, Dan Kolb wrote:
> NorthLondon John wrote:
> 
> >The last hardware problem I have is with the cdrom. This is acessible by 
> >root, but not by any users. It's not a permissions problem - the error I 
> >get when trying, eg, to play an audio cd, is:
> >
> >mount: wrong fs type, bad option, bad superblock on dev/hdc,
> >or too many mounted file systems
> 
> If you're playing an audio CD, you shouldn't be mounting it. You'll need 
> the appropriate CD playing software. Audio CDs don't have a file system 
> on them, hence the 'bad superblock' on it. Can you mount a data CD as a 
> user? If not, you may need to put the option 'user' in the appropriate 
> place in the fstab file (so the CD options should look like: 'noauto,user').

That's not necessary - Debian has the "cdrom" group which contains the users
that have access to the cdrom device.

> >In the course of looking into this, I found some oddities with the 
> >filesystem:
> >1:  /dev/hdc has two entries in the fstab - /cdrom and /media/cdrom
> >
> >2: fstab has swap on /dev/hda5 - 165mb according to system monitor; 
> >kdiskfree doesn't show this, but has tmpfs mounted at /dev/shm (size: 
> >30.4mb, free 30.4mb, Full% 0.0%). What is tmpfs? Is it equivalent to 
> >swap? Why don't the numbers add up?
> 
> Swap partitions aren't actually mounted to any point on the file system, 
> hence kdiskfree doesn't show it (neither will df).

The 'free' command, however, will show swap usage, as will 'top'.

Pete
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