The Wikipedia page claims you can get Nero InCD to solve your problem. Google also turned up another option that might work for you.

Prices on DVD-RAM media seem to range from $4-$10 per 10GB disk. To get 500GB of storage, that means you're paying $200, minimum. This contrasts with external USB hard drive, where (according to NewEgg), you can get a 500GB disk + USB enclosure for $250. It's a lot easier to handle one big USB disk than 50 DVD-RAM cartridges.