Many sub-$30 DVD-RW drives claim DVD-RAM compatibility; do a search on Newegg for DVD-RAM.
Then if your OS supports DVD-RAM natively, it should appear as any other removable device - you can read it, format it, etc. Notably WinXP required packet writing software to support DVD-RAM, and it didn't like anything but FAT32 formatted media [Note: This information is based on my experience several years ago, so things might have improved]. Apparently Vista and OSX have native support.
Vista even lists my cheap Samsung drive as DVD-RAM, rather than CD/DVD; don't have any DVD-RAM media to check on functionality.
Based on Wiki info? OSX only natively supports certain drives, and those drives need to have the correct firmware to operate correctly under OSX. With each new update of OSX, more drives are supported, but if you have an unofficial drive, you need to make sure the vendor says it runs under whatever version of OSX you are running. I presume similar limitations exist with other OS's, best be sure to check *all* of the requirements. Sometimes Toast will recognize a drive, and you can use that software with it, before OSX natively supports such and such drive. YMMV.
DVD-RAM sure is expensive! DL Verbatim, LM linked to are $13ea! (includes shipping, but still). Seems the lowest cost DVD-RAM are the potentially the highest quality...from Panasonic (
Taiyo Yuden) For now, still made in Japan. Verbatim, made in India, Singapore, Taiwan...and possibly other countries...so can you be sure it's archival quality, or not?
http://www.digitalfaq.com/reviews/dvd-media.htm
Sure would be nice if Blu-R recordable 50GB media were to drop in price, that's ~$50ea at present, absurd.