DVD-RAM—the only consumer optical format to store data in physically sectored concentric rings like a hard drive, rather than in a spiral groove. When it was introduced in 1999, the 4.7GB disc
DVD-RAM - Wikipedia
Maxell 9.4GB DVD-RAM Disc with Cartridge 636045 B&H Photo Video
LG GP65NS60 - DVD±RW (±R DL) / DVD-RAM drive - USB 2.0 - external - GP65NS60 - DVD & Blu-Rays - CDW.com