Hmmmm, I believe RAM can be used as storage. The only problem is this. Imagine having an 80GB RAM for a hard drive. Do you realize how expensive this would be? The price would be so high that it doesn't become feasible.
I'm thinking of flash drives, like the ones we use for our PDAs, digital cameras, cell phones, etc. My cell phone uses a microSD drive on a tiny little disk and it is used as a STORAGE device. IT even says that in the instruction manual, lol. So if they can use flash ram as a storage device, I see no reason why we can't use them as permanent storage for a regular computer. My PDA use a SD drive and it's been sitting in there for the last year and a half collecting dust. The data are still on there just it would be on a hard drive. I accessed it like a few weeks ago and the data are still intact. Data access time would be significantly improved. We're beginning to see a shift in memory storage as more and more device are using flash drives. This is key in future development. What's really neat are these little mini or micro SD drives come with adapters so you can put them in standard SD drives to access them. Anything is possible, lol.