I need to know how to use non dell disks that are the supported types for my MD3000i and MD1000. These disks are for backup purposes and I do not need to spend 3X with dell for this purpose. How do you flash them to get them to be supported by the MD?

All the research I've seen shows Dell disks are the only supported configuration. You might try the break/fix forum on the Dell community site with your question, although I don't have much confidence you'll see a different answer:
http://en.community.dell.com/forums/1216.aspx

Good luck!

Contrary to just about every thread you will find on this subject, it is actually possible to do - i have witnessed this performed somewhere. You would need 2x MD3000i units, and one of them must be the original "first generation" firmware to pull this off. I have only seen this work with one specific model of disk, and that was a disk from the compatible drives list in the manual.

That said though, and i can not stress this enough - just don't do it. If it's a production unit and the data and warranty is important to you, get proper Dell certified and supplied disks.