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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 4584 reports on 2833 titles representing 1.03% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (5014)
  2. Air Force One: Special Edition [71886]  (2117)
  3. Starship Troopers [71716]  (1620)
  4. Contact: Special Edition [15041]  (1593)
  5. Under Siege 2: Dark Territory [13665]  (1584)
  6. Cable Guy, The [82426]  (1344)
  7. Lost Highway [ID3946PG]  (1320)
  8. Ace Ventura: When Nature Calls [23500]  (1248)
  9. Men in Black [82656]  (1200)
  10. Heavy Metal [74656]  (924)
  11. Net, The [11616]  (912)
  12. Copycat [14168]  (893)
  13. Fugitive, The [21000]  (880)
  14. Fan, The [82476]  (833)
  15. Professional, The [74746]  (782)
  16. Dante's Peak [43311]  (779)
  17. Jumanji [11746]  (663)
  18. Fifth Element, The [82406]  (646)
  19. Striptease [84976]  (645)
  20. Shawshank Redemption, The [74596]  (602)
  21. Game, The [ID4260PG]  (555)
  22. Beauty and the Beast: Work in Progress [1591 CS]  (480)
  23. Fargo [800638693-1]  (406)
  24. Boot, Das (The Boat) [99916]  (390)
  25. Demolition Man [12985]  (377)
  26. First Knight [71176]  (360)
  27. Batman Returns [15000]  (338)
  28. Multiplicity [82446]  (308)
  29. The Beatles: Let It Be [4508-80]  (297)
  30. Fair Game [14072]  (288)
  31. Dolores Claiborne [59906]  (275)
  32. Volcano [0603985]  (264)
  33. Johnny Mnemonic [73476]  (240)
  34. Barb Wire [800639927-1]  (230)
  35. Batman & Robin [16500]  (220)
  36. Hamlet [94996]  (210)
  37. Grumpier Old Men [14191]  (210)
  38. Star Wars Trilogy: Definitive Collection [0693-84]  (200)
  39. Crimes of Passion: Special Edition [LVD9523]  (168)
  40. I Come in Peace [LVD9603]  (168)
  41. Hunchback of Notre Dame, The [7955 AS]  (162)
  42. Tin Cup [14318]  (160)
  43. Grosse Pointe Blank [10040 AS]  (144)
  44. Bad Boys [10716]  (144)
  45. Maximum Risk [27416]  (136)
  46. Craft, The [82416]  (133)
  47. City of Lost Children, The [40016]  (128)
  48. Gattaca [82646]  (120)
  49. Anaconda [81756]  (120)
  50. Mute Witness [41176]  (119)
  51. Last Action Hero, The [27936]  (112)
  52. Disclosure [13575]  (112)
  53. Day After, The [13755]  (102)
  54. Willow [79356]  (98)
  55. Close Encounters of the Third Kind: Special Edition [76866]  (96)
  56. Donnie Brasco [82516]  (91)
  57. Usual Suspects, The [800638689-1]  (90)
  58. Gunsmith Cats Chapter: vol.1 [CAVGS/001]  (90)
  59. WarGames [4714-80]  (90)
  60. Ace Ventura: Pet Detective [23000]  (90)
  61. Hook [70606]  (88)
  62. Raw Deal [LVD9545]  (85)
  63. Alien 3 [5593-85]  (84)
  64. JFK [12306]  (84)
  65. Aliens: Special Widescreen Collector's Edition [1504-85]  (80)
  66. Seven Years in Tibet [21816]  (78)
  67. Dracula: Dead and Loving It [80096]  (78)
  68. Indian in the Cupboard, The [11646]  (78)
  69. Sense and Sensibility [11596]  (77)
  70. Robocop [ID5168]  (75)
  71. Fire Down Below [14914]  (72)
  72. In the Line of Fire [52316]  (72)
  73. Lawrence of Arabia [79626]  (70)
  74. Double Team [83236]  (70)
  75. Sword and the Sorcerer, The [13-010]  (70)
  76. Man for All Seasons, A [80986]  (70)
  77. Blade Runner: Director's Cut [12682]  (68)
  78. Unforgiven [12531]  (66)
  79. I Know What You Did Last Summer: Special Edition [23926]  (66)
  80. Replacement Killers, The [21626]  (66)
  81. Welcome to the Dollhouse [82566]  (65)
  82. Titanic [LV334812-WS]  (64)
  83. Jerry Maguire [82536]  (60)
  84. Abyss, The: Special Edition [1988-85]  (60)
  85. Specialist, The [13574]  (60)
  86. Kate Bush: The Whole Story [080 504-1]  (60)
  87. Laserdisc: What it is, How it works [USP-001]  (55)
  88. Blade Runner: Special Edition [CC1120L]  (55)
  89. Twilight Zone: The Movie [11314 LV]  (55)
  90. Client, The [13233]  (55)
  91. At Home with Donald Duck [D61-505]  (52)
  92. Devil's Own, The [82466]  (52)
  93. Japan: Oil on Canvas [MP116-15VN]  (52)
  94. Crash: Special Edition [CC1500L]  (52)
  95. Yor: The Hunter from the Future [VLD 6070]  (52)
  96. Gwendoline (Perils of Gwendoline) [G78F5010]  (50)
  97. Tingler, The [07776]  (50)
  98. Switchblade Sisters: Special Edition [RT1001L]  (48)
  99. Maverick [13374]  (48)
  100. Lethal Weapon 3 [12475]  (45)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1241)
  2. Pioneer USA  (749)
  3. Pioneer Japan  (456)
  4. PDO UK  (342)
  5. 3M or IMATION  (196)
  6. Mitsubishi  (179)
  7. Kuraray  (134)
  8. Technidisc  (104)
  9. Sonopress  (100)
  10. DiscoVision (MCA)  (97)
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.