Are Cd-Rs and DVDs read-only

CD-Rs (Compact Disc Recordable) are initially writable but can be read-only once the data is finalized. In contrast, DVDs can be either read-only (like DVD-ROMs) or writable (like DVD-R and DVD+R), with the writable types becoming read-only after data is burned. Thus, while CD-Rs can become read-only, not all DVDs are inherently read-only.