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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 4068 reports on 2603 titles representing 1% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (4284)
  2. Air Force One: Special Edition [71886]  (1550)
  3. Cable Guy, The [82426]  (1344)
  4. Starship Troopers [71716]  (1320)
  5. Lost Highway [ID3946PG]  (1320)
  6. Contact: Special Edition [15041]  (1296)
  7. Under Siege 2: Dark Territory [13665]  (1281)
  8. Net, The [11616]  (1092)
  9. Men in Black [82656]  (903)
  10. Ace Ventura: When Nature Calls [23500]  (855)
  11. Jumanji [11746]  (756)
  12. Copycat [14168]  (714)
  13. Professional, The [74746]  (672)
  14. Heavy Metal [74656]  (663)
  15. Fan, The [82476]  (660)
  16. Striptease [84976]  (645)
  17. Dante's Peak [43311]  (624)
  18. Fifth Element, The [82406]  (592)
  19. Fugitive, The [21000]  (527)
  20. Shawshank Redemption, The [74596]  (444)
  21. Game, The [ID4260PG]  (416)
  22. Beauty and the Beast: Work in Progress [1591 CS]  (406)
  23. Fargo [800638693-1]  (378)
  24. Batman Returns [15000]  (338)
  25. First Knight [71176]  (297)
  26. The Beatles: Let It Be [4508-80]  (297)
  27. Boot, Das (The Boat) [99916]  (275)
  28. Volcano [0603985]  (253)
  29. Fair Game [14072]  (253)
  30. Multiplicity [82446]  (250)
  31. Dolores Claiborne [74756]  (240)
  32. Demolition Man [12985]  (220)
  33. Barb Wire [800639927-1]  (216)
  34. Grumpier Old Men [14191]  (180)
  35. Star Wars Trilogy: Definitive Collection [0693-84]  (171)
  36. Tin Cup [14318]  (160)
  37. Batman & Robin [16500]  (153)
  38. Last Action Hero, The [27936]  (144)
  39. Gattaca [82646]  (136)
  40. Hamlet [94996]  (136)
  41. City of Lost Children, The [40016]  (128)
  42. Raw Deal [LVD9545]  (126)
  43. Grosse Pointe Blank [10040 AS]  (120)
  44. Crimes of Passion: Special Edition [LVD9523]  (119)
  45. Hunchback of Notre Dame, The [7955 AS]  (112)
  46. Johnny Mnemonic [73476]  (112)
  47. Maximum Risk [27416]  (112)
  48. Disclosure [13575]  (112)
  49. Fire Down Below [14914]  (105)
  50. Sense and Sensibility [11596]  (104)
  51. Craft, The [82416]  (102)
  52. In the Line of Fire [52316]  (99)
  53. Anaconda [81756]  (98)
  54. Close Encounters of the Third Kind: Special Edition [76866]  (96)
  55. Seven Years in Tibet [21816]  (96)
  56. I Come in Peace [LVD9603]  (96)
  57. Gunsmith Cats Chapter: vol.1 [CAVGS/001]  (90)
  58. JFK [12306]  (84)
  59. Willow [79356]  (84)
  60. Aliens: Special Widescreen Collector's Edition [1504-85]  (80)
  61. Day After, The [13755]  (80)
  62. Dracula: Dead and Loving It [80096]  (78)
  63. Indian in the Cupboard, The [11646]  (78)
  64. Donnie Brasco [82516]  (72)
  65. Usual Suspects, The [800638689-1]  (70)
  66. Double Team [83236]  (70)
  67. Man for All Seasons, A [80986]  (70)
  68. Blade Runner: Director's Cut [12682]  (68)
  69. Replacement Killers, The [21626]  (66)
  70. Hook [70606]  (63)
  71. Mute Witness [41176]  (60)
  72. Alien 3 [5593-85]  (60)
  73. Devil's Own, The [82466]  (56)
  74. Muppet Treasure Island [7076 AS]  (52)
  75. Yor: The Hunter from the Future [VLD 6070]  (52)
  76. Japan: Oil on Canvas [MP116-15VN]  (52)
  77. Gwendoline (Perils of Gwendoline) [G78F5010]  (50)
  78. I Know What You Did Last Summer: Special Edition [23926]  (50)
  79. Switchblade Sisters: Special Edition [RT1001L]  (48)
  80. Lawrence of Arabia [79626]  (48)
  81. Abyss, The: Special Edition [1988-85]  (45)
  82. Lethal Weapon 3 [12475]  (45)
  83. Specialist, The [13574]  (45)
  84. Sleepless in Seattle [52416]  (44)
  85. Welcome to the Dollhouse [82566]  (44)
  86. Close to You: Remembering the Carpenters [CLV7278]  (44)
  87. Ace Ventura: Pet Detective [23000]  (44)
  88. Alien: Special Widescreen Collector's Edition [1090-85]  (42)
  89. Class of 1999 [PCLV-10002]  (40)
  90. Superman: The Movie [1013 LV]  (40)
  91. Jerry Maguire [82536]  (40)
  92. Crash: Special Edition [CC1500L]  (40)
  93. Bad Boys [10716]  (40)
  94. Adventures of Baron Munchausen, The [76986]  (40)
  95. Crumb [10696]  (40)
  96. Virgin Queen of St. Francis High [ID5273ME]  (39)
  97. Extreme Measures [94926]  (36)
  98. Mask, The [ID2992LI]  (36)
  99. Bernadette Peters: In Concert [74-008]  (36)
  100. Greystoke: The Legend of Tarzan Lord of the Apes [11375 LV]  (36)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1131)
  2. Pioneer USA  (655)
  3. Pioneer Japan  (409)
  4. PDO UK  (287)
  5. Mitsubishi  (164)
  6. 3M or IMATION  (162)
  7. Kuraray  (120)
  8. Technidisc  (101)
  9. Sonopress  (90)
  10. DiscoVision (MCA)  (83)
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.