diff -r 2146aa2221c0 -r d196e99343ee laser-disk.rst
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+-*- 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.
+
+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 |
++----------+-----------+---------------+------+--------+
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