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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 7343 reports on 4198 titles representing 0.98% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (7560)
  2. Air Force One: Special Edition [71886]  (6360)
  3. Starship Troopers [71716]  (4140)
  4. Ace Ventura: When Nature Calls [23500]  (3115)
  5. Jumanji [11746]  (2958)
  6. Cable Guy, The [82426]  (2856)
  7. Copycat [14168]  (2607)
  8. Contact: Special Edition [15041]  (2590)
  9. Net, The [11616]  (2560)
  10. Men in Black [82656]  (2442)
  11. Under Siege 2: Dark Territory [13665]  (2291)
  12. Heavy Metal [74656]  (1980)
  13. Lost Highway [ID3946PG]  (1764)
  14. Shawshank Redemption, The [74596]  (1690)
  15. Fugitive, The [21000]  (1430)
  16. Professional, The [74746]  (1416)
  17. Striptease [84976]  (1265)
  18. Beauty and the Beast: Work in Progress [1591 CS]  (1224)
  19. Dante's Peak [43311]  (1173)
  20. Fan, The [82476]  (1134)
  21. Fifth Element, The [82406]  (990)
  22. Fargo [800638693-1]  (903)
  23. Game, The [ID4260PG]  (874)
  24. Demolition Man [12985]  (861)
  25. Volcano [0603985]  (756)
  26. Gattaca [82646]  (648)
  27. Batman Returns [15000]  (544)
  28. Willow [79356]  (525)
  29. Bad Boys [10716]  (512)
  30. Boot, Das (The Boat) [99916]  (496)
  31. Johnny Mnemonic [73476]  (486)
  32. Fair Game [14072]  (465)
  33. The Beatles: Let It Be [4508-80]  (442)
  34. Dolores Claiborne [59906]  (434)
  35. Mute Witness [41176]  (429)
  36. First Knight [71176]  (416)
  37. Multiplicity [82446]  (392)
  38. Ace Ventura: Pet Detective [23000]  (390)
  39. I Know What You Did Last Summer: Special Edition [23926]  (364)
  40. Batman & Robin [16500]  (364)
  41. Barb Wire [800639927-1]  (336)
  42. I Come in Peace [LVD9603]  (336)
  43. Hunchback of Notre Dame, The [7955 AS]  (312)
  44. Tin Cup [14318]  (312)
  45. Fire Down Below [14914]  (312)
  46. Grumpier Old Men [14191]  (300)
  47. Anaconda [81756]  (286)
  48. Hamlet [94996]  (276)
  49. Star Wars Trilogy: Definitive Collection [0693-84]  (273)
  50. Maximum Risk [27416]  (253)
  51. Abyss, The: Special Edition [1988-85]  (242)
  52. Devil's Own, The [82466]  (240)
  53. Blade Runner: Special Edition [CC1120L]  (220)
  54. Aliens: Special Widescreen Collector's Edition [1504-85]  (216)
  55. To Die For [73436]  (209)
  56. Double Team [83236]  (207)
  57. Crimes of Passion: Special Edition [LVD9523]  (198)
  58. Blade Runner: Director's Cut [12682]  (198)
  59. WarGames [4714-80]  (192)
  60. Donnie Brasco [82516]  (180)
  61. Hoodlum [ML106282]  (162)
  62. Craft, The [82416]  (160)
  63. Alien: Special Widescreen Collector's Edition [1090-85]  (156)
  64. Jerry Maguire [82536]  (152)
  65. Lethal Weapon 2 [11876]  (144)
  66. Buck Rogers in the 25th Century [13-002]  (144)
  67. American President, The [80176]  (140)
  68. Raw Deal [LVD9545]  (140)
  69. Lawrence of Arabia [79626]  (140)
  70. Last Action Hero [27936]  (136)
  71. Usual Suspects, The [800638689-1]  (136)
  72. Grosse Pointe Blank [10040 AS]  (135)
  73. Dracula: Dead and Loving It [80096]  (135)
  74. Now You Can See the Music [080 546-1]  (133)
  75. Switchblade Sisters: Special Edition [RT1001L]  (126)
  76. Video Standard, A [LD-101]  (126)
  77. Kate Bush: The Whole Story [080 504-1]  (126)
  78. Sense and Sensibility [11596]  (120)
  79. Tuff Turf [I-5027]  (120)
  80. Replacement Killers, The [21626]  (120)
  81. Hook [70606]  (117)
  82. Dire Straits: Brothers in Arms [080 166-9]  (114)
  83. Adventures of Baron Munchausen, The [76986]  (114)
  84. Seven Years in Tibet [21816]  (112)
  85. Sword and the Sorcerer, The [13-010]  (112)
  86. Disclosure [13575]  (112)
  87. ABBA [74-006]  (112)
  88. Close to You: Remembering the Carpenters [CLV7278]  (108)
  89. Day After, The [13755]  (108)
  90. Muppet Treasure Island [7076 AS]  (108)
  91. Pavarotti & Friends: For War Child [440 074 202-1]  (108)
  92. Class of 1999 [PCLV-10002]  (105)
  93. Extreme Measures [94926]  (105)
  94. Unforgiven [12531]  (104)
  95. Boyz N the Hood: Special Edition [CC1289L]  (104)
  96. Specialist, The [13574]  (104)
  97. Lethal Weapon 3 [12475]  (104)
  98. Client, The [13233]  (104)
  99. Desperado: Special Edition [11656]  (104)
  100. Robocop [ID5168]  (102)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1761)
  2. Pioneer USA  (1161)
  3. PDO UK  (808)
  4. Pioneer Japan  (681)
  5. 3M or IMATION  (377)
  6. Mitsubishi  (273)
  7. Kuraray  (224)
  8. Technidisc  (167)
  9. DiscoVision (MCA)  (148)
  10. DADC Austria  (145)
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.