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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 7187 reports on 4124 titles representing 0.97% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (7375)
  2. Air Force One: Special Edition [71886]  (6360)
  3. Starship Troopers [71716]  (3872)
  4. Jumanji [11746]  (2958)
  5. Ace Ventura: When Nature Calls [23500]  (2890)
  6. Cable Guy, The [82426]  (2856)
  7. Copycat [14168]  (2607)
  8. Contact: Special Edition [15041]  (2448)
  9. Net, The [11616]  (2340)
  10. Men in Black [82656]  (2336)
  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. Dante's Peak [43311]  (1173)
  19. Beauty and the Beast: Work in Progress [1591 CS]  (1150)
  20. Fan, The [82476]  (1134)
  21. Fifth Element, The [82406]  (924)
  22. Fargo [800638693-1]  (903)
  23. Game, The [ID4260PG]  (874)
  24. Demolition Man [12985]  (861)
  25. Volcano [0603985]  (756)
  26. Gattaca [82646]  (595)
  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. First Knight [71176]  (416)
  36. Ace Ventura: Pet Detective [23000]  (390)
  37. I Know What You Did Last Summer: Special Edition [23926]  (364)
  38. Multiplicity [82446]  (351)
  39. Mute Witness [41176]  (336)
  40. Barb Wire [800639927-1]  (336)
  41. I Come in Peace [LVD9603]  (336)
  42. Batman & Robin [16500]  (325)
  43. Fire Down Below [14914]  (312)
  44. Tin Cup [14318]  (312)
  45. Hunchback of Notre Dame, The [7955 AS]  (312)
  46. Grumpier Old Men [14191]  (300)
  47. Hamlet [94996]  (276)
  48. Star Wars Trilogy: Definitive Collection [0693-84]  (273)
  49. Maximum Risk [27416]  (253)
  50. Anaconda [81756]  (252)
  51. Abyss, The: Special Edition [1988-85]  (210)
  52. To Die For [73436]  (209)
  53. Double Team [83236]  (207)
  54. Blade Runner: Special Edition [CC1120L]  (200)
  55. Devil's Own, The [82466]  (198)
  56. Blade Runner: Director's Cut [12682]  (198)
  57. Crimes of Passion: Special Edition [LVD9523]  (198)
  58. WarGames [4714-80]  (192)
  59. Donnie Brasco [82516]  (180)
  60. Hoodlum [ML106282]  (162)
  61. Craft, The [82416]  (160)
  62. Alien: Special Widescreen Collector's Edition [1090-85]  (156)
  63. Jerry Maguire [82536]  (152)
  64. Lethal Weapon 2 [11876]  (144)
  65. Buck Rogers in the 25th Century [13-002]  (144)
  66. Aliens: Special Widescreen Collector's Edition [1504-85]  (143)
  67. American President, The [80176]  (140)
  68. Lawrence of Arabia [79626]  (140)
  69. Usual Suspects, The [800638689-1]  (136)
  70. Last Action Hero [27936]  (136)
  71. Grosse Pointe Blank [10040 AS]  (135)
  72. Dracula: Dead and Loving It [80096]  (135)
  73. Now You Can See the Music [080 546-1]  (133)
  74. Replacement Killers, The [21626]  (128)
  75. Kate Bush: The Whole Story [080 504-1]  (126)
  76. Switchblade Sisters: Special Edition [RT1001L]  (126)
  77. Video Standard, A [LD-101]  (126)
  78. Sense and Sensibility [11596]  (120)
  79. Tuff Turf [I-5027]  (120)
  80. Raw Deal [LVD9545]  (114)
  81. Dire Straits: Brothers in Arms [080 166-9]  (114)
  82. Adventures of Baron Munchausen, The [76986]  (114)
  83. ABBA [74-006]  (112)
  84. Disclosure [13575]  (112)
  85. Sword and the Sorcerer, The [13-010]  (112)
  86. Seven Years in Tibet [21816]  (112)
  87. Pavarotti & Friends: For War Child [440 074 202-1]  (108)
  88. Day After, The [13755]  (108)
  89. Close to You: Remembering the Carpenters [CLV7278]  (108)
  90. Muppet Treasure Island [7076 AS]  (108)
  91. Extreme Measures [94926]  (105)
  92. Class of 1999 [PCLV-10002]  (105)
  93. Desperado: Special Edition [11656]  (104)
  94. Client, The [13233]  (104)
  95. Boyz N the Hood: Special Edition [CC1289L]  (104)
  96. Specialist, The [13574]  (104)
  97. Lethal Weapon 3 [12475]  (104)
  98. Unforgiven [12531]  (104)
  99. Robocop [ID5168]  (102)
  100. JFK [12306]  (102)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1741)
  2. Pioneer USA  (1135)
  3. PDO UK  (793)
  4. Pioneer Japan  (671)
  5. 3M or IMATION  (365)
  6. Mitsubishi  (268)
  7. Kuraray  (222)
  8. Technidisc  (162)
  9. DiscoVision (MCA)  (146)
  10. DADC Austria  (140)
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.