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Old 11th May 2008
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Default very easy and powerfull way for make ISO file

which way is best and powerful way for make ISO file from directories ????
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Old 11th May 2008
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You can use mkisofs to create iso files. It's included in cdrtools package.

Last edited by erno; 11th May 2008 at 04:47 PM.
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Old 11th May 2008
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The man page has various examples as well, including one that does exactly what you're asking.
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Old 11th May 2008
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http://www.freebsd.org/doc/en_US.ISO...ating-cds.html
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Old 11th May 2008
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if you want something easy and powerful go with 'k3b'.
its a front end for the various cd/dvd tools like mkisofs, cdrecord etc.
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Old 12th May 2008
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Thanks Guys
Can I make ISO file with dd and cat ???
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Old 12th May 2008
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Yes, both will work:

# cat /dev/acd0 > myimage.iso
# dd if=/dev/acd0 of=anotherimage.iso
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Old 12th May 2008
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Quote:
Originally Posted by Carpetsmoker View Post
Yes, both will work:

# cat /dev/acd0 > myimage.iso
# dd if=/dev/acd0 of=anotherimage.iso
So I understand I can use dd and cat for make ISO files from CDROM and CD

IS this true ???
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Old 12th May 2008
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No, it's not true, I was lying earlier. (<-- joke)

An "ISO file" or "disk image" is just a filesystem inside a file, cat and dd will both just make a "raw copy" of anything, here are some example uses (Not very useful, just proof of concept):

Make a floppy image and write put it to another floppy
# cat /dev/fd0 > floppy.img
# cat floppy.img > /dev/fd1

Copy a partition:
# cat /dev/ad0s1a > /dev/ad1s1a

Copy CDROM to disk and mount it
# cat /dev/acd0 > /dev/ad0s1d
# mount_cd9660 /dev/ad0s1d /mnt/cdrom

"Secure" erase a disk
# cat /dev/random > /dev/ad0

Make a backup
# cat /dev/ad0 | gz > backup.img.gz
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Old 12th May 2008
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@Carpetsmoker

How could I check the image after burning?
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Old 12th May 2008
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Oliver: isovfy is part of cdrecord.

Last edited by tuck; 12th May 2008 at 09:26 AM.
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tar(1) supports ISO9660:
% tar tf image.iso
% tar tf /dev/acd0

More reliable would be:
Code:
# mdconfig -at vnode -f image.iso
# mount -t cd9660 /dev/md0 /mnt/md0
# cd /mnt/md0

# find . -type f -exec md5 {} \; > ~/MD5.img[/cmd]
# cd -
# umount /mnt/md0; mdconfig -du0

[burn image]

# mount -t cd9660 /dev/acd0 /mnt/acd0
# cd /mnt/acd0
# find . -type f -exec md5 {} \; > ~/MD5.disc
# diff -u ~/MD5.img MD5.disc
If I remember correctly, the GNU version of md5 can read a file and check the files automatically, but it seems BSD md5 doesn't have this functionality...
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Old 12th May 2008
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Ah uh oh shame on me... I thought verifying if the .iso isn't broken or else like that, not verifying if the data is correctly writen...
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Thx

>not verifying if the data is correctly writen...

Yes this was my intention.
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Old 12th May 2008
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Quote:
Originally Posted by Carpetsmoker View Post
More reliable would be:
Code:
# mdconfig -at vnode -f image.iso
# mount -t cd9660 /dev/md0 /mnt/md0
# cd /mnt/md0

# find . -type f -exec md5 {} \; > ~/MD5.img[/cmd]
# cd -
# umount /mnt/md0; mdconfig -du0

[burn image]

# mount -t cd9660 /dev/acd0 /mnt/acd0
# cd /mnt/acd0
# find . -type f -exec md5 {} \; > ~/MD5.disc
# diff -u ~/MD5.img MD5.disc
this method has the advantage that you would know which files are corrupted.

but if you just want to check if the cd is an corrupted or not:

$ md5 < image.iso > image.md5

[burn image]

$ dd < /dev/acd0 bs=2k | md5 | cmp - image.md5 && echo Ok
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Old 12th May 2008
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actually, no need to use md5 this would likely be much faster:

$ dd < /dev/acd0 bs=2k | cmp - image.iso && echo Ok


btw, calculating the checksum of all the files being burned (similiar to what carpetsmoker suggested) and storing it in a file on the cd (say file.md5) is IMO a good idea. so that if the cd develops problems in the future you can easily tell which files are ok by comparing the files on the cd with their md5sums in file.md5.
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Old 12th May 2008
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Quote:
Originally Posted by ephemera View Post
btw, calculating the checksum of all the files being burned (similiar to what carpetsmoker suggested) and storing it in a file on the cd (say file.md5) is IMO a good idea.
Sure it is, especially for a big one. Thats what I do if I need to seed a torrent file

It also a good idea if you enclose a SHA256 checksum in the package as well
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thanks all guys you help to learn many information abut ISO .
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Old 12th May 2008
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Quote:
Originally Posted by 18Googol2 View Post
It also a good idea if you enclose a SHA256 checksum in the package as well
while sha1/sha256 are crypographically more secure than md5 they more expensive to calculate - something to keep in mind for checksumming large files.

Last edited by ephemera; 12th May 2008 at 01:11 PM.
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Yeah, nobody cares to spoof my torrent's MD5s, my torrents are crap btw

The fact is, an algorithm is said to be secure if its impossible to generate identical hash strings, from different source, which is not the case of MD5. Also MD5 hash can be decrypted with rainbow table. I reakon we will be moving to SHA256 in near future, so what I was saying is to get yourself be familiar with SHA256 is not a bad idea
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