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     3 * What best DVD-R or DVD+R?

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

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

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

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

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    13 See

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    15   http://en.wikipedia.org/wiki/DVD-R

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

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    18 * What capacity of DVD?

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    20 +----------+-------------------------------------------+

    21 |          |                Capacity                   |

    22 +  Type    +-----------+---------------+------+--------+

    23 |          | sectors   | bytes         | GB   |  GiB   |

    24 |          | 2,048B    |               |      |        |

    25 +----------+-----------+---------------+------+--------+

    26 |DVD-R (SL)| 2,298,496 | 4,707,319,808 | 4.7  |  4.384 |

    27 |DVD+R (SL)| 2,295,104 | 4,700,372,992 | 4.7  |  4.378 |

    28 |DVD-R DL  | 4,171,712 | 8,543,666,176 | 8.5  |  7.957 |

    29 |DVD+R DL  | 4,173,824 | 8,547,991,552 | 8.5  |  7.961 |

    30 +----------+-----------+---------------+------+--------+

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