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by toast0 848 days ago
CD-RW, DVD-RW, DVD+RW, and DVD-RAM all support random access writes of some form, and can be used as live block devices. CD-R, DVD-R, and DVD+R can be used too, with limitations because it's a write once media; you can't really erase anything, so you'll fill up the disc eventually.

Probably similar for BD-RE (recordable, erasable) and BD-R, too.