Puppy Linux Discussion Forum Forum Index Puppy Linux Discussion Forum
Puppy HOME page : puppylinux.com
"THE" alternative forum : puppylinux.info
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

The time now is Fri 31 Oct 2014, 16:54
All times are UTC - 4
 Forum index » House Training » HOWTO ( Solutions )
How to make iso file from CD with readcd
Moderators: Flash, Ian, JohnMurga
Post new topic   Reply to topic View previous topic :: View next topic
Page 1 of 1 [3 Posts]  
Author Message
kethd

Joined: 20 Oct 2005
Posts: 451
Location: Boston MA USA

PostPosted: Tue 14 Mar 2006, 21:47    Post subject:  How to make iso file from CD with readcd  

There are many ways to make an iso file from a CD, using dd or even just cat. Sometimes these work. Sometimes they do not.

Graveman can be used to do this, but sometimes it fails with peculiar, frustrating errors.

The best way I have found so far is from the command line:
# readcd -v dev=ATAPI:/dev/hdc f=cd.iso
which offers good running commentary about progress and any errors encountered.

Before doing this, you might want to do:
# isoinfo -d -i /dev/hdc
which will tell you the blocksize (usually 2048 for CDs) and the record count (volume size).

If you make a perfect, standard iso file from a CD (like Puppy 1.0.8r1), you can then use md5sum to make sure that your iso file is identical to the original official iso file. This is a way to make sure that your CD is perfect. And a way to make sure that you have a good iso file, for burning more copies.

I used 1.0.8r1 to make an iso file and then burn a copy of itself with Burniso2cd. The burn seemed to go OK, but then there were weird problems. When I tried to make an iso file from the copy, graveman complained right at the end. When I tried various ways of reading the CD, sometimes it read OK, sometimes problems at the end. It seems to boot OK -- the problem seems to be with some trailer blocks at the end.

Isoinfo says the record count is 31582, which seems correct for 108r1. dd and cat sometimes only get 31580 recs, and then md5sum does not match. But readcd thinks there are 31584 recs, and then fails when it tries to read off the end.

It would be nice if there were some super-CD-inspect tool, that could tell you in absurd detail exactly what is on the CD, what problems are where, and what could cause that.

I did the burn with a new NEC ND-3550A DVD burner. Now I don't know if the problem was the burner, or using 1.0.8r1, or just bad luck.
Back to top
View user's profile Send private message 
kethd

Joined: 20 Oct 2005
Posts: 451
Location: Boston MA USA

PostPosted: Mon 20 Mar 2006, 21:00    Post subject:  

For further tech discussion, see:
http://www.murga.org/%7Epuppy/viewtopic.php?t=6915
CD Burn Glitch - two extra sectors
Back to top
View user's profile Send private message 
Lobster
Official Crustacean


Joined: 04 May 2005
Posts: 15117
Location: Paradox Realm

PostPosted: Thu 18 May 2006, 21:04    Post subject:  

http://www.petri.co.il/how_to_write_iso_files_to_cd.htm
_________________
Puppy WIKI
Back to top
View user's profile Send private message Visit poster's website 
Display posts from previous:   Sort by:   
Page 1 of 1 [3 Posts]  
Post new topic   Reply to topic View previous topic :: View next topic
 Forum index » House Training » HOWTO ( Solutions )
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group
[ Time: 0.0416s ][ Queries: 11 (0.0037s) ][ GZIP on ]