Cant create/convert image to read/write with Disk Utility

dear all, because of some reasons, I have to combine files from 2 Recovery DVDs into one, and since the first disc is bootable and have guiding program installed, so my idea is:
1. Create a read/write image of the first disc
2. Mount the image
3. Add files of disk 2 into the image
I'm using Mac OS X 10.6.6 and Disk Utility is 11.5.2
My question is:
No matter I choose "New Image" and select "read/write" to create a new image, or I choose "Convert" and select "read/write" to convert a created image, the results are the same: I still get READ-ONLY image only.
Is there any trick, or is the version of disk utility got some issues?
Or is there any other free tool can do so?
I have Toast 10 and it's image merging functions seemed not working either...
Thanks all in advance

If your database version is 11g R2 then you can use active database duplication as Hermant says.
http://taliphakanozturken.wordpress.com/2011/06/26/creating-standby-database-with-rman-active-database-duplication-in-11gr2/
Otherwise you need data pump export/import, transportable tablespace, etc to transfer your data.
Talip Hakan Ozturk
http://taliphakanozturken.wordpress.com/

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Disclaimer: Apple does not necessarily endorse any suggestions, solutions, or third-party software / products that may be mentioned in this topic. Apple encourages you to first seek a solution at Apple Support. The following links are provided as is, with no guarantee of the effectiveness or reliability of the information. Apple does not guarantee that these links will be maintained or functional at any given time. Use the information above at your own discretion.

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