How Come the iMac Can't Boot Snow Leopard DVDs Anymore Under Lion and ML?

Hi. I'm using ML as my main OS but I noticed when after installing Mountain Lion it doesn't recognize and just ejects the Snow Leopard DVD installers that came with my Mac (you could boot to it when the iMac had Snow Leopard). It doesn't see it as bootable anymore (it doesn't appear as bootable when you boot then press option nor does Startup in System Preferences see it as bootable. The DVD's are in good condition coz' it's not used that often):
Windows 7 Ultimate & Windows 8 Release Preview installer on a DVD-RW which is sees as blank (but it works find on a PC).
Only Snow Leopard that's in a USB (not sure how they made that but it was made for me by Apple repair center). I did back the SL DVDs years ago as .cdr (Master). I'm not sure if the .cdr images of the original SL DVDs can be burned into dual layer DVDs and work like the original (how do you go about that? Do you just burn .cdr like you would with .iso or .dmg?)
I think the hidden recovery partition starting with Lion is actually preventing DVDs from SL to lower versions from being recognized as bootable. Same with bootable Windows DVD-RW as Apple and the rest of the industry (I noticed netbooks now have recovery partitions too) switch to hidden partition and USB installers instead of medias like DVDs and CDs. I would guess if you could install Snow Leopard using an SL USB installer and complete erase the main hardisk along with the hidden recovery partition, install Snow Leopard it'll recognize Windows burned in DVD-RW again.
I can't install Bootcamp coz' it sees Windows 7 & 8 installers as blank drives, even Windows USB installers are not bootable (both USB and DVD-RW installers work fine on the PC). I'm thinking of disabling the iMac's Superdrive by moving in a folder or renaming its driver/extension IOSDVDStorageFamily.kext maybe tomorrow so hopefully when BootCamp sees that the iMac doesn't have an optical drive it'll show the Create USB Installer option (now it only show 2 options) so that it'll create the installers into the Flash drive.
I'm anxious of booting the USB Snow Leopard Installer and erasing the drive completely along with ML's recovery partition then installing SL in the hardisk because my Time Machine backup could get messed up. It might not restore the ones backedup by Lion and ML, although I could manually copy paste the documents but that'll defeat the main purpose of having a Time Machine backup.
Has anyone experienced this too with their Snow Leopard DVDs and Windows USB installers? Any solutions?
Thank you in advance.
God bless.

Zap the PRAM and Reset the SMC, then try again.

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lounginBob wrote:
Though I have another Snow Leopard DVD, that I purchased earlier for my older Mac.
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How Come the iMac Can't Boot Snow Leopard DVDs Anymore Under Lion and ML?

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