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 Forum index » Advanced Topics » Cutting edge » Multi-session live-CD/DVD
Problem continuing a multisession CD. (Solved)
Moderators: Flash, Ian, JohnMurga
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hamoudoudou

Joined: 24 Jul 2014
Posts: 1467
Location: rabat

PostPosted: Thu 28 Jun 2018, 07:53    Post subject: last Puppy able to save cd multissession. ..  

a question posted somewhere is what is the last Puppy able to save cd .multissession. ..
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tallboy


Joined: 21 Sep 2010
Posts: 1043
Location: Oslo, Norway

PostPosted: Thu 28 Jun 2018, 19:03    Post subject:  

I asked, and did not get any good answer...
I also have a problem with a multisession CD that is locked after the first save, and I am not good enough to interpret the code in /usr/sbin/savesession-dvd to find the culprit.

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Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 13079
Location: Arizona USA

PostPosted: Thu 28 Jun 2018, 21:39    Post subject:  

What do you mean, locked?
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tallboy


Joined: 21 Sep 2010
Posts: 1043
Location: Oslo, Norway

PostPosted: Fri 29 Jun 2018, 14:29    Post subject:  

The CD will not accept another save, because the multisession function is locked. It should remain open after each session is saved, but a codeline somewhere locks it. Where, I don't know.
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Flash
Official Dog Handler


Joined: 04 May 2005
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Location: Arizona USA

PostPosted: Sat 30 Jun 2018, 01:08    Post subject:  

That's never happened to me. Which Puppy and how many sessions were saved on the CD?
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James C


Joined: 26 Mar 2009
Posts: 6728
Location: Kentucky

PostPosted: Sat 30 Jun 2018, 02:01    Post subject:  

The thread in question is here.
http://www.murga-linux.com/puppy/viewtopic.php?p=990495#990495


For what it's worth, I haven't tried every Puppy release as a multi-session but I try a lot of them and don't recall any failures yet.Any in particular you would like me to test I'd be glad to.

Just had a Tahr multi-session dvd fill up last night, I already had another dvd burned with Tahr and I merely replaced the full dvd with the empty,everything saved to the fresh dvd and all was good.
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Burn_IT


Joined: 12 Aug 2006
Posts: 3270
Location: Tamworth UK

PostPosted: Sat 30 Jun 2018, 07:23    Post subject:  

I think he means the CD was "closed"/"finalised" so further updates are not allowed.
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Flash
Official Dog Handler


Joined: 04 May 2005
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Location: Arizona USA

PostPosted: Sat 30 Jun 2018, 08:30    Post subject:  

The CD specification only allows 99 tracks on a CD even if there's room for more. I'm not sure if a saved session counts as a track. That may depend on the drive manufacturer's interpretation of the specification. I think the DVD specification allows as many tracks as will fit on the DVD. Again, I don't know if a session counts as a track.
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rufwoof

Joined: 24 Feb 2014
Posts: 2628

PostPosted: Sun 09 Sep 2018, 15:50    Post subject:  

Flash wrote:
You're mostly correct. Burniso2cd will overwrite what's on a rewritable disk, but only as much of it as the iso will cover. Burniso2cd doesn't erase the rest of the stuff that might be on the disk. I found this out the hard way when I made an exact copy of a multisession Puppy that Burniso2cd had made of a used DVD-RW. The exact copy of what should have been about a 200 MB multisession Puppy filled a whole DVD! Turned out, I'd used a rewritable DVD that had been filled with a movie or something, so the whole disk was filled. Laughing
Thank goodness this didn't make any difference when it came to using the Puppy that Burniso2cd had burned onto the DVD-RW. All the stuff on the disk past the end of the iso was ignored.

For a DVD+RW disc I use peasydisc to first blank the dvd, then format it, then burn the (in my case Fatdog) iso. Seems to keep the entire DVD disc clean that way. I'm tending to only keep a couple of saves (I've set event manager save interval to zero i.e. only on demand and mostly I just shutdown without saving as I keep all my data external to the OS). First save is all my customisation's (installed gtk3 for instance), next is google chrome. So when I want to update google chrome I boot excluding the last save (so no prior google version is installed in that session), blank/format/burn-iso and then save-session - so now the disc I've just booted no longer has a 2nd save (google) on the disc, I then download/install the latest chrome and save session again - so I'm back to as before, but where the second save on the DVD disc is the later version of chrome. Fundamentally once I've the system setup/configured to work well with my hardware I care little about program versions - with the exception of the browser (prefer to run the latest for the better security benefits). No local HDD is used, data is served to Fatdog via my OpenBSD data server that automatically connects and mounts /data (other data on that box is inaccessible other than from its own console i.e. outbound connection initialisations only and only shares a single folder (Fatdog's /data folder content)).

Pristine OS (with personalisation configuration changes) and pristine latest browser after each boot, with core/main data isolated so that the likes of a during session ransomware attack I only lose the content of the /data folder - which is regularly (automatic incremental) backed up to another folder on the OpenBSD box - that outside of the reverse sshfs connection/mount it makes to Fatdog that box can't even be seen by Fatdog.

If the Fatdog system were lost/stolen, then there's nothing of interest to the thief/finder. No data, no passwords etc. If a hacker breaks into a Fatdog session then making something persistent is "difficult". They might read/corrupt /data at worst, but where that data is easily restored and excludes more personal data/docs (that are stored in other OpenBSD file server folders). And attempts to get at that data server - well OpenBSD base system only is renowned for their focus upon security.

Every user should consider what if/when my desktop system is stolen, what if/when someone secures root cli ...etc. type risks and consider the impacts that might have, including the risks/damage that might be caused to others sharing the same LAN. LiveCD boots are one potential part of risk mitigation.

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Last edited by rufwoof on Mon 10 Sep 2018, 01:52; edited 1 time in total
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rufwoof

Joined: 24 Feb 2014
Posts: 2628

PostPosted: Sun 09 Sep 2018, 16:17    Post subject:  

tallboy wrote:
I asked, and did not get any good answer...
I also have a problem with a multisession CD that is locked after the first save, and I am not good enough to interpret the code in /usr/sbin/savesession-dvd to find the culprit.

I have noticed in Fatdog that using pburn to burn a rw dvd disc resulted in it being registered as a dvd-r on my kit, whereas peasydisc correctly writes it as a dvd-rw. Whether that's a software bug or hardware issue (dvd drive/DVD's being used ...etc.) ???

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tallboy


Joined: 21 Sep 2010
Posts: 1043
Location: Oslo, Norway

PostPosted: Sun 09 Sep 2018, 19:16    Post subject:  

The disc in question is a CD-R. I always use Burniso2cd. The disc was burnt multisession when I saved my remastered, live Lucid 5.2.8.7 .iso to the disc. I managed to save one session to the disc after the initial burn, but it would not accept to save any sessions later. The saves themselves were only small modifications to config files, no large volumes.

Burn_IT wrote:
I think he means the CD was "closed"/"finalised" so further updates are not allowed.

Yes, sorry about using the incorrect expression. Foreigner, you know! Rolling Eyes .

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perdido


Joined: 09 Dec 2013
Posts: 1037
Location: ¿Altair IV , Just north of Eeyore Junction.?

PostPosted: Sun 09 Sep 2018, 19:51    Post subject: Re: last Puppy able to save cd multissession. ..  

hamoudoudou wrote:
a question posted somewhere is what is the last Puppy able to save cd .multissession. ..


Upup Bionic Beaver saves a DVD multi session
http://www.murga-linux.com/puppy/viewtopic.php?p=1004071#1004071

I guess it does CD also.



.
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tallboy


Joined: 21 Sep 2010
Posts: 1043
Location: Oslo, Norway

PostPosted: Fri 14 Sep 2018, 12:34    Post subject:  

The Bionic Beaver is unfortunately too big!
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Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 13079
Location: Arizona USA

PostPosted: Fri 14 Sep 2018, 13:35    Post subject:  

Too big for what, a CD?
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tallboy


Joined: 21 Sep 2010
Posts: 1043
Location: Oslo, Norway

PostPosted: Fri 14 Sep 2018, 16:09    Post subject:  

For the amount of available RAM in my 17 year old PC...
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