Both types of discs can be written to only once but read many times.
The difference lies in their formatting and how they read data on the disc.
Unlike VHS cassettes and floppy diskettes, DVDs are unaffected by magnetic fields.
Lifewire / Theresa Chiechi
A double-sided/single-layer disc can store 9.4 GB, while a double-sided/dual-layer DVD has a 17.1 GB storage capacity.
History
The DVD-R format was developed by Pioneer and was released in the second half of 1997.
DVD+R was developed by Sony and Philips and was introduced in 2002.
Different industry groups back each format.
But as we’ve mentioned, today most drives are “hybrid drives” that will support either format.
Are DVDs Relevant Anymore?
High-quality DVDs stored correctly can last more than 50 years, but does it even matter anymore?
With the advent of internet streaming, some speculate that DVD media and hardware are heading for obsoletion.
While demand for DVDs is clearly diminishing, they are still very much in use.
The technology will continue to exists as long as there is a demand.
