Useful tip: Run LiveCD and eject CD

**Fabianx** · 09-05-2004, 03:12 AM

Originally Posted by drmarathe

knoppix@ttyp2[knoppix]$ sudo umount -l /cdrom
umount: /cdrom: not mounted
knoppix@ttyp2[knoppix]$ sudo eject /dev/cdrom
eject: unable to find or open device for: `/dev/cdrom'
knoppix@ttyp2[knoppix]$ mount /dev/cdrom
mount: mount point /mnt/auto/cdrom does not exist

2.6 in Knoppix 3.4 had some problems:

sudo eject /dev/scd0 or /dev/hdX should work though.

cu

Fabian

**Fabianx** · 09-05-2004, 05:07 AM

Hi,

this is really really cool.

Now we can copy to HD / RAM while running from CD, which basically also allows changing the applications that run from the CD! Changing is just limited by the number of cloop devices, which is sad :-/ due to a bug (?) in cloop ...

Code:

# copy to HD
mount /mnt/hda6
rsync -avP /cdrom/KNOPPIX /mnt/hda6/

# load from HD
losetup /dev/cloop1 /mnt/hda6/KNOPPIX/KNOPPIX
mount /dev/cloop1 /KNOPPIX

# remove CD
umount -l /cdrom
eject /dev/cdrom

# fill in /cdrom again (optional)
# either through --move or --bind
mount --bind /mnt/hda6 /cdrom

Thats it.

Possibilities are of course again unlimited. This could create an ISO on the fly from the CD and then insert it, copy to NTFS partitions and whatever you have not even thought of.

I'm still working on a solution to put out the CD cleanly without risking cloop to not be able to read some blocks ... (when you can't change to another backing device)

Possibly you could just copy (e.g. videoplayer) whats necessary to ramdisk and then run from there ...

cu

Fabian

**drmarathe** · 09-06-2004, 08:46 AM

Fabien,

That worked. i.e.
#sudo eject /dev/scd0

It looks like I have to start the video/audio playing program beforehand and then eject the Knoppix CD, put a video/music Cd. Which is ok.

But I tried to remount the Knoppix CD
with
# mount /mnt/cdrom
or
#mount /dev/scd0

But the first gives an error saing no valid fstab entry. Doue he umount remove this entry or what? How can I remount the Knoppix CD after finishing playing a music/video CD.

Thanks

**Fabianx** · 09-06-2004, 03:56 PM

Originally Posted by drmarathe

Fabien,

That worked. i.e.
#sudo eject /dev/scd0

It looks like I have to start the video/audio playing program beforehand and then eject the Knoppix CD, put a video/music Cd. Which is ok.

But I tried to remount the Knoppix CD

Just use:

Code:

sudo mount /dev/scd0 /cdrom

cu

Fabian

**bfree** · 09-18-2004, 06:08 PM

NOTE: All the instructions in this seem to be superceeded by my discovery of bootfrom, I'd done it and written it though so I'm posting them just in case they are useful to anyone!

Of course instead of copying tohd, if you already have the iso on your hd you can just loop mount that, even if the iso is sitting on NTFS!

Code:

knoppix@ttyp0[knoppix]$ sudo su -
# replace /dev/hda2 with the device holding your iso
root@ttyp0[~]# mount /mnt/hda2
root@ttyp0[~]# mkdir /locdrom
# loopback mount the iso
root@ttyp0[~]# mount -o loop /mnt/hda2/1bfree/2burn/knoppix_3.7_PC-Welt.iso /locdrom/
# setup and mount the cloop
root@ttyp0[~]# losetup /dev/cloop1 /locdrom/KNOPPIX/KNOPPIX
root@ttyp0[~]# mount -o ro /dev/cloop1 /KNOPPIX
# now you can umount the cd and eject it
root@ttyp0[~]# umount -l /cdrom
root@ttyp0[~]# eject /dev/scd0
# (optional) fill the /cdrom back in so everything shoudl appear correct
root@ttyp0[~]# mount --bind /locdrom/ /cdrom

Now of course I just have to remember to unmount it all again (but of course it is only mounted read only

So it means any poor soul with a machine fully formatted to ntfs and only one cd/dvd drive can download knoppix to the ntfs drive from the devils OS (or if they get a cd can they use rawrite under xp to copy it across? or what other free tool would there be), burn it, boot it, swap in the on-ntfs iso and then eject the cd. Of course I now realise you could just as easily burn it (or stick a cd in the drive) and then copy out the KNOPPIX folder under windows and use fromhd, but where's the fun in that (and it means using double the disc space or deleting the iso)!

Perhaps knoppix-autoconfig should have an option like "fromhd=iso:/dev/hda2" ... wait, when did bootfrom arrive (it's in 3.6 anyway)

Looks like all I really needed instead of all the above was "bootfrom=/dev/hda2/1bfree/2burn/k*.iso". It seems Fabian is way ahead of me as always

I'll have to look at how bootfrom works! Next stop allowing it to load multiple cloops from cheatcodes (though I guess there is no point until someone builds a suitable second image to load).

Perhaps this post will help someone else realise bootfrom is what they need! I just went and tried it and it boots off the cd, switches to the iso and releases the cd drive (so you can eject the cd), magic!

**A. Jorge Garcia** · 09-19-2004, 04:50 PM

What about toram?

I can do this on some of my PCs which have about 1GB of RAM. However, most PCs I use won't be able to handle this.

Does anyone know if Damn Small Linux does toram? DSL is a lot like KNOPPIX as its a pared-down remaster that only takes a 50MB ISO! I have used it on occassion on the road to access my DEBIAN server at school so I can use all the apps I want. I never tried toram with DSL. I burn DSL on the 210MB 8cm CDRs, but it could even fit on one of those Business Card or Credit Card sized CDRs.

Just my 2 cents,
AJG

**firebyrd10** · 09-19-2004, 07:10 PM

Originally Posted by A. Jorge Garcia

What about toram?

I can do this on some of my PCs which have about 1GB of RAM. However, most PCs I use won't be able to handle this.

Does anyone know if Damn Small Linux does toram? DSL is a lot like KNOPPIX as its a pared-down remaster that only takes a 50MB ISO! I have used it on occassion on the road to access my DEBIAN server at school so I can use all the apps I want. I never tried toram with DSL. I burn DSL on the 210MB 8cm CDRs, but it could even fit on one of those Business Card or Credit Card sized CDRs.

Just my 2 cents,
AJG

Yea, it has toram. Omly takes a few minutes too.

If it could support my computer I would buy a copy (A. to Help devoplement. B. Because I want one of those creditcard cds that I can't find anywhere.)

**A. Jorge Garcia** · 09-19-2004, 11:52 PM

I know, the only place I've seen the Business Card CDRs is:

http://cgi.ebay.com/ws/eBayISAPI.dll...123929535&rd=1

Regards,
AJG

**OErjan** · 09-21-2004, 06:08 PM

hmmm, i ordered some 50Mb Cd's this summer from
http://www.clasohlson.se/
perhaps you could get from there.
EDIT i found some 30Mb (Verbatim ) here
http://www.dataprince.se/webshop/sho...&article=43027
/EDIT

**dolzenko** · 01-23-2005, 04:52 PM

killer! thanks a lot for a tip. this "lazy" umount seems to discard "in use" thing.
P.S. the same situation here - hd crashed, and now it seems i could go well without it