I have download 15CD ISO doe Debian. I wonder if therer is a way to convert
these CD ISO to DVD ISO. Then, I just need two or three DVD for my debian installation.

I

Those cd's are organized so that the installer will know which software is on which cd.
During installation it will ask for CD1 or CD5 ...
That would not work when you reorganize all the data into DVD sized chunks.
It is doable but not without knowing how the installer works (you can let it scan the media AFAIK).
To install you really only need the first (or the first few) CD's. If you have a working internet connection you could do the rest using that.

And not at all easy to get right the first time.
One member used 30 cdrom's for a similar experiment.

Regards

This is for FreeBSD but you should get the idea.
http://it.toolbox.com/blogs/bsd-guru...d-70-dvd-22791

I used the below procedures to make a single DVD ISO image from five CD ISO images for Oracle Enterprise Linux (RHEL Clone).

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Make a copy of the first ISO representing disk 1. Once you have done that, use an application that will allow you to open and modify the copied ISO. From within Windows, I use MagicISO to accomplish this task.

From there, I combine the remaining disks into the single ISO file. In the case of Oracle Enterprise Linux, CentOS, Red Hat, and other RHEL clones, only the Server or Client directories in disks 2 through 5 will be populated with files.

In this example, take disk 2’s files from the Server directory and combine them into disk 1’s Server directory. Do the same for disk 3 and so on. The other directories will be empty, but open them to make sure.

Under each disk, there is a file named .diskinfo that contains information similar to below.

1212029472.049054
Enterprise Linux Server 5
i386
1
Server/base
Server/RPMS
Server/pixmaps

The number listed on the fourth line represents the disk number. Now, in the ISO that contains all of the files from the other disks (the file size should now be close to 2.6GB), change the file .diskinfo to show other disks as shown below.

1212029472.049054
Enterprise Linux Server 5
i386
1,2,3,4,5
Server/base
Server/RPMS
Server/pixmaps

With the combined ISO and modified .diskinfo file, save the new ISO. Do a Linux ls or a Windows dir command to verify the file size.

05/28/2008 07:59 PM 656,979,968 Enterprise-R5-U2-Server-i386-disc1.iso
05/28/2008 07:59 PM 668,844,032 Enterprise-R5-U2-Server-i386-disc2.iso
05/28/2008 07:59 PM 661,444,608 Enterprise-R5-U2-Server-i386-disc3.iso
05/28/2008 07:59 PM 665,561,088 Enterprise-R5-U2-Server-i386-disc4.iso
05/28/2008 07:59 PM 132,192,256 Enterprise-R5-U2-Server-i386-disc5.iso
08/08/2008 07:47 PM 2,744,307,712 Enterprise-R5-U2-Server-i386-dvd.iso

Presuming the diskinfo information is available on the Debian CDs, you would create the iso in Linux by creating a directory on your hard drive. You then would copy the information from several CDs into this directory, creating the appropriate structure for your final DVD. You then would make the diskinfo changes that were appropriate.

Then, using K3B, you would write this directory to your DVD, or you could write it to an iso file on the hard drive.