It's a bird! It's a plane!
It's a deadly rotten LD thrown in anger by its owner!
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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 5552 reports on 3304 titles representing 1.03% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (6534)
  2. Air Force One: Special Edition [71886]  (3549)
  3. Starship Troopers [71716]  (2310)
  4. Contact: Special Edition [15041]  (2208)
  5. Net, The [11616]  (2044)
  6. Cable Guy, The [82426]  (1876)
  7. Under Siege 2: Dark Territory [13665]  (1872)
  8. Ace Ventura: When Nature Calls [23500]  (1836)
  9. Men in Black [82656]  (1624)
  10. Heavy Metal [74656]  (1566)
  11. Jumanji [11746]  (1550)
  12. Copycat [14168]  (1550)
  13. Lost Highway [ID3946PG]  (1508)
  14. Professional, The [74746]  (1357)
  15. Fugitive, The [21000]  (1152)
  16. Shawshank Redemption, The [74596]  (918)
  17. Striptease [84976]  (918)
  18. Dante's Peak [43311]  (860)
  19. Fan, The [82476]  (850)
  20. Game, The [ID4260PG]  (828)
  21. Fifth Element, The [82406]  (798)
  22. Beauty and the Beast: Work in Progress [1591 CS]  (722)
  23. Fargo [800638693-1]  (702)
  24. Demolition Man [12985]  (684)
  25. Batman Returns [15000]  (528)
  26. Boot, Das (The Boat) [99916]  (420)
  27. Volcano [0603985]  (416)
  28. The Beatles: Let It Be [4508-80]  (416)
  29. Willow [79356]  (406)
  30. Fair Game [14072]  (406)
  31. First Knight [71176]  (403)
  32. Dolores Claiborne [59906]  (336)
  33. Bad Boys [10716]  (300)
  34. Barb Wire [800639927-1]  (297)
  35. I Come in Peace [LVD9603]  (297)
  36. Gattaca [82646]  (276)
  37. Multiplicity [82446]  (275)
  38. Johnny Mnemonic [73476]  (273)
  39. Batman & Robin [16500]  (264)
  40. Grumpier Old Men [14191]  (242)
  41. Hamlet [94996]  (242)
  42. Fire Down Below [14914]  (231)
  43. Star Wars Trilogy: Definitive Collection [0693-84]  (220)
  44. WarGames [4714-80]  (200)
  45. Hunchback of Notre Dame, The [7955 AS]  (190)
  46. Maximum Risk [27416]  (180)
  47. Aliens: Special Widescreen Collector's Edition [1504-85]  (180)
  48. Blade Runner: Director's Cut [12682]  (168)
  49. Mute Witness [41176]  (168)
  50. Crimes of Passion: Special Edition [LVD9523]  (168)
  51. Alien: Special Widescreen Collector's Edition [1090-85]  (156)
  52. Ace Ventura: Pet Detective [23000]  (154)
  53. Desperado: Special Edition [11656]  (153)
  54. Abyss, The: Special Edition [1988-85]  (153)
  55. Tin Cup [14318]  (152)
  56. Anaconda [81756]  (144)
  57. Donnie Brasco [82516]  (144)
  58. Double Team [83236]  (144)
  59. Last Action Hero [27936]  (136)
  60. Blade Runner: Special Edition [CC1120L]  (136)
  61. Usual Suspects, The [800638689-1]  (136)
  62. Disclosure [13575]  (135)
  63. Day After, The [13755]  (133)
  64. City of Lost Children, The [40016]  (128)
  65. Sense and Sensibility [11596]  (120)
  66. Craft, The [82416]  (119)
  67. Raw Deal [LVD9545]  (114)
  68. Grosse Pointe Blank [10040 AS]  (112)
  69. Dracula: Dead and Loving It [80096]  (112)
  70. I Know What You Did Last Summer: Special Edition [23926]  (112)
  71. Muppet Treasure Island [7076 AS]  (108)
  72. Unforgiven [12531]  (104)
  73. Devil's Own, The [82466]  (96)
  74. Excalibur [22030]  (95)
  75. Kate Bush: The Whole Story [080 504-1]  (95)
  76. Jerry Maguire [82536]  (90)
  77. ABBA [74-006]  (90)
  78. Hook [70606]  (88)
  79. Tingler, The [07776]  (84)
  80. Boyz N the Hood: Special Edition [CC1289L]  (84)
  81. Video Standard, A [LD-101]  (84)
  82. Alien 3 [5593-85]  (84)
  83. To Die For [73436]  (84)
  84. Titanic [LV334812-WS]  (81)
  85. Few Good Men, A [27896]  (78)
  86. Seven Years in Tibet [21816]  (78)
  87. Specialist, The [13574]  (77)
  88. Robocop [ID5168]  (75)
  89. Legends of the Fall [78726]  (72)
  90. In the Line of Fire [52316]  (72)
  91. Switchblade Sisters: Special Edition [RT1001L]  (70)
  92. Sword and the Sorcerer, The [13-010]  (70)
  93. Welcome to the Dollhouse [82566]  (70)
  94. Adventures of Baron Munchausen, The [76986]  (70)
  95. Lawrence of Arabia [79626]  (70)
  96. Pavarotti & Friends: For War Child [440 074 202-1]  (70)
  97. Hoodlum [ML106282]  (70)
  98. American President, The [80176]  (70)
  99. Dire Straits: Brothers in Arms [080 166-9]  (70)
  100. Replacement Killers, The [21626]  (66)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1451)
  2. Pioneer USA  (888)
  3. Pioneer Japan  (528)
  4. PDO UK  (507)
  5. 3M or IMATION  (235)
  6. Mitsubishi  (224)
  7. Kuraray  (168)
  8. Technidisc  (130)
  9. DiscoVision (MCA)  (109)
  10. Sonopress  (106)
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.