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Topic: Making CD/DVD images

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Zucca

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Posted: Feb. 23 2007,17:14

Am I assuming right if it's this simple:

Code Sample

cat /dev/cdrom >> cdimage.iso

Code Sample

cp /dev/cdrom cdimage.iso

Or as compressed:

Code Sample

bzip2 /dev/cdrom >> cdimage.iso.bz

Is any of those the right way?

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mikshaw

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Posted: Feb. 23 2007,20:32

it's generally done either with dd or mkisofs. Using the methods you mention (with the exception of cat, perhaps?) do not properly keep the filesystem and file permissions/ownership intact, so you're essentially just making a backup of the files themselves.

"dd if=/dev/cdrom of=cdimage.iso" is probably the simplest way.

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Zucca

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Joined: Feb. 2006

Posted: Feb. 23 2007,21:53

Ok.
So with command dd it's for sure. dd makes exact copies?

So..

Code Sample

dd if=/dev/cdrom | bzip2 >> cdimage.iso.bz2

Is the best/easiest way to make it compressed?

Actually 7zip would be the best to archive best compression.
http://warp.povusers.org/ArchiverComparison

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Do you have it? - http://dy.fi/mak

mikshaw

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Posted: Feb. 23 2007,22:38

As far as I can tell you, dd makes exact copies.
I've only used it maybe 6 or 7 times in my life, but it seems to be pretty much a cloning tool

Your code sample looks like it should work as expected.

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Zucca

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Posts: 524
Joined: Feb. 2006

Posted: Feb. 23 2007,23:00

Some things in UNIX world just are more simple than in Windows world. =)

But on to next question:
Let's say:
I have my hard disk image named hd.iso.
I want to put all the data back from it to hda.
I have made the image like this:

Code Sample

dd if=/dev/hda of=hd.iso

If I do this:

Code Sample

cat hd.iso >> /dev/hda

I belive it writes all the data back to it (boot sector, partition table, contents, etc...)?

But if I create image from a partition (for example /dev/hda1) it includes only the contents of that partition (excluding partition info, bootsector; but including file permissions)?

Back in the days when I used Macintosh I could create CD:s with partitions more than one. So if I had 650Mb hard disk around here divided to two or more partitions and I make image of it. Then burn to CD. The CD would have those partitions? If so, how would the partitions be shown in /dev?

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9 replies since Feb. 23 2007,17:14

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Damn Small Linux Board » Non-DSL Topics » Programming and Scripting » Making CD/DVD images