-*- outline -*-

* What best DVD-R or DVD+R?

The DVD-R format was developed by Pioneer in 1997 vc DVD+R in 2002 by Sony.

DVD+R format was not an official DVD format until January 25, 2008.

DVD-R(W) and DVD+R(W) format are incompatible.

DVD-R(W) use amplitude modulation, DVD+R(W) use phase modulation, so more reliable.

On multi-session DVD-R(W) disk any session take up to 96 MB in time on DVD+R(W)
every session take exactly 2 MB.

DVD+R(W) win!

See

  http://en.wikipedia.org/wiki/DVD-R
  http://en.wikipedia.org/wiki/DVD%2BR

* What capacity of DVD?

+----------+-------------------------------------------+
|          |                Capacity                   |
+  Type    +-----------+---------------+------+--------+
|          | sectors   | bytes         | GB   |  GiB   |
|          | 2,048B    |               |      |        |
+----------+-----------+---------------+------+--------+
|DVD-R (SL)| 2,298,496 | 4,707,319,808 | 4.7  |  4.384 |
|DVD+R (SL)| 2,295,104 | 4,700,372,992 | 4.7  |  4.378 |
|DVD-R DL  | 4,171,712 | 8,543,666,176 | 8.5  |  7.957 |
|DVD+R DL  | 4,173,824 | 8,547,991,552 | 8.5  |  7.961 |
+----------+-----------+---------------+------+--------+