Third Law: A LD Player must protect its own existence as long as such protection does not conflict with the First or Second Laws
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Laser Rot

Well, Laser Rot is a problem important enough to deserve a dedicated page.

Metal Layer Oxydation (also called laser rot) is the plague of LDs. Impossible to forecast, useless to fight, it can happen anytime during the lifetime of a disc. Hopefully not all LD titles manufactured are suffering from this disease and some Factories are more famous than others on this issue (SONY DADC being #1).

Current Status 9367 reports on 5202 titles representing 0.98% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (12388)
  2. Air Force One: Special Edition [71886]  (8556)
  3. Starship Troopers [71716]  (5148)
  4. Cable Guy, The [82426]  (4160)
  5. Jumanji [11746]  (3854)
  6. Ace Ventura: When Nature Calls [23500]  (3666)
  7. Men in Black [82656]  (3471)
  8. Copycat [14168]  (3268)
  9. Net, The [11616]  (3256)
  10. Contact: Special Edition [15041]  (2812)
  11. Under Siege 2: Dark Territory [13665]  (2340)
  12. Lost Highway [ID3946PG]  (2336)
  13. Beauty and the Beast: Work in Progress [1591 CS]  (2178)
  14. Heavy Metal [74656]  (1856)
  15. Shawshank Redemption, The [74596]  (1728)
  16. Fargo [800638693-1]  (1680)
  17. Professional, The [74746]  (1664)
  18. Striptease [84976]  (1638)
  19. Fugitive, The [21000]  (1568)
  20. Dante's Peak [43311]  (1430)
  21. Game, The [ID4260PG]  (1425)
  22. Demolition Man [12985]  (1323)
  23. Fifth Element, The [82406]  (1200)
  24. Fan, The [82476]  (1176)
  25. Volcano [0603985]  (1092)
  26. Batman Returns [15000]  (722)
  27. Gattaca [82646]  (648)
  28. Boot, Das (The Boat) [99916]  (630)
  29. First Knight [71176]  (624)
  30. Johnny Mnemonic [73476]  (608)
  31. Willow [79356]  (608)
  32. Bad Boys [10716]  (561)
  33. Fair Game [14072]  (560)
  34. Batman & Robin [16500]  (527)
  35. I Know What You Did Last Summer: Special Edition [23926]  (527)
  36. The Beatles: Let It Be [4508-80]  (504)
  37. Multiplicity [82446]  (496)
  38. Star Wars Trilogy: Definitive Collection [0693-84]  (486)
  39. Ace Ventura: Pet Detective [23000]  (448)
  40. Aliens: Special Widescreen Collector's Edition [1504-85]  (442)
  41. Barb Wire [800639927-1]  (434)
  42. Mute Witness [41176]  (429)
  43. Devil's Own, The [82466]  (390)
  44. Double Team [83236]  (336)
  45. Donnie Brasco [82516]  (325)
  46. Dolores Claiborne [59906]  (324)
  47. Fire Down Below [14914]  (312)
  48. WarGames [4714-80]  (308)
  49. Grumpier Old Men [14191]  (300)
  50. Tin Cup [14318]  (300)
  51. Craft, The [82416]  (300)
  52. Dracula: Dead and Loving It [80096]  (299)
  53. Lethal Weapon 2 [11876]  (299)
  54. To Die For [73436]  (299)
  55. ABBA [74-006]  (280)
  56. Maximum Risk [27416]  (276)
  57. Hunchback of Notre Dame, The [7955 AS]  (276)
  58. Crimes of Passion: Special Edition [LVD9523]  (275)
  59. Blade Runner: Director's Cut [12682]  (264)
  60. I Come in Peace [LVD9603]  (264)
  61. Blade Runner: Special Edition [CC1120L]  (260)
  62. Anaconda [81756]  (260)
  63. Jerry Maguire [82536]  (242)
  64. Hoodlum [ML106282]  (231)
  65. Hamlet [94996]  (231)
  66. Alien: Special Widescreen Collector's Edition [1090-85]  (224)
  67. Desperado: Special Edition [11656]  (220)
  68. Switchblade Sisters: Special Edition [RT1001L]  (216)
  69. 300 [113764]  (200)
  70. Abyss, The: Special Edition [1988-85]  (200)
  71. Eurythmics: Live [080 220-1]  (198)
  72. Video Standard, A [LD-101]  (198)
  73. Gunsmith Cats Chapter: vol.1 [CAVGS/001]  (198)
  74. Kate Bush: The Whole Story [080 504-1]  (192)
  75. Indian in the Cupboard, The [11646]  (189)
  76. Matilda [86866]  (180)
  77. Buck Rogers in the 25th Century [13-002]  (176)
  78. Hook [70606]  (170)
  79. Dire Straits: Brothers in Arms [080 166-9]  (168)
  80. Muppet Treasure Island [7076 AS]  (168)
  81. Grosse Pointe Blank [10040 AS]  (160)
  82. Last Action Hero [27936]  (152)
  83. Lethal Weapon 3 [12475]  (150)
  84. Unforgiven [12531]  (150)
  85. Dirty Dancing [ID5172]  (147)
  86. Star Trek I: The Motion Picture [LV 8858]  (147)
  87. Sense and Sensibility [11596]  (144)
  88. Disclosure [13575]  (144)
  89. Raw Deal [LVD9545]  (140)
  90. Lawrence of Arabia [79626]  (140)
  91. Sword and the Sorcerer, The [13-010]  (136)
  92. Tuff Turf [I-5027]  (136)
  93. Usual Suspects, The [800638689-1]  (136)
  94. Michael Jackson: Making Michael Jackson's Thriller [VL1000]  (133)
  95. Close to You: Remembering the Carpenters [CLV7278]  (133)
  96. Now You Can See the Music [080 546-1]  (133)
  97. Few Good Men, A [27896]  (128)
  98. Extreme Measures [94926]  (128)
  99. Death Wish [LV 8774]  (128)
  100. JFK [12306]  (126)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (2032)
  2. Pioneer USA  (1519)
  3. PDO UK  (1213)
  4. Pioneer Japan  (883)
  5. 3M or IMATION  (483)
  6. Mitsubishi  (322)
  7. Kuraray  (268)
  8. DiscoVision (MCA)  (227)
  9. Technidisc  (217)
  10. DADC Austria  (162)
Ranking is defined as Nb of Reports/Factory

Note that humidity/water do not provoke laser rot. I sadly had a water disaster in my basement and some of my LDs spent 8 hours half immersed in freezing water. Except for the damaged covers and inserts, the disc are still playing nicely.

The main consequence of rot are those "multicolor video speckles/lines" appearing randomly on your screen and becoming more visible at the start or at the beginning of a side.

A stronger consequence can also affect the Digital Audio Tracks that will play with "clicks" and sometimes become completely mute for a few 10th of second because the data is so distored that it has no more meaning for your A/V Amp. This happened to me on Princess Bride CRITERION.

The final effect of a deadly rot will be a completely unwatchable LD. The player simply won't find it's start/timing/chapter sequence and give up playing after several tentatives.

Note that 8" LD Single do not use glue to keep the two sides together and should not be affected by laser rot. None reported so far.

Also, rot is disc/side dependant and could affect Side A while Side B remains untouched. People with access to several copies of the same set might sometimes be able to "reconstruct" a rot-free full set by checking each disc individually and selecting only the good ones.