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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 4761 reports on 2904 titles representing 1.04% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (5424)
  2. Air Force One: Special Edition [71886]  (2250)
  3. Starship Troopers [71716]  (1708)
  4. Under Siege 2: Dark Territory [13665]  (1700)
  5. Lost Highway [ID3946PG]  (1534)
  6. Cable Guy, The [82426]  (1525)
  7. Contact: Special Edition [15041]  (1482)
  8. Ace Ventura: When Nature Calls [23500]  (1430)
  9. Men in Black [82656]  (1275)
  10. Net, The [11616]  (1113)
  11. Copycat [14168]  (1071)
  12. Jumanji [11746]  (1056)
  13. Heavy Metal [74656]  (968)
  14. Dante's Peak [43311]  (924)
  15. Fugitive, The [21000]  (880)
  16. Professional, The [74746]  (864)
  17. Fan, The [82476]  (833)
  18. Game, The [ID4260PG]  (680)
  19. Shawshank Redemption, The [74596]  (675)
  20. Fifth Element, The [82406]  (646)
  21. Striptease [84976]  (645)
  22. Beauty and the Beast: Work in Progress [1591 CS]  (629)
  23. First Knight [71176]  (540)
  24. Fargo [800638693-1]  (406)
  25. Demolition Man [12985]  (377)
  26. Boot, Das (The Boat) [99916]  (364)
  27. Batman Returns [15000]  (338)
  28. The Beatles: Let It Be [4508-80]  (336)
  29. Multiplicity [82446]  (308)
  30. Dolores Claiborne [59906]  (308)
  31. Fair Game [14072]  (288)
  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. I Come in Peace [LVD9603]  (198)
  40. Hunchback of Notre Dame, The [7955 AS]  (190)
  41. Tin Cup [14318]  (189)
  42. Crimes of Passion: Special Edition [LVD9523]  (168)
  43. Gattaca [82646]  (153)
  44. Willow [79356]  (144)
  45. Anaconda [81756]  (144)
  46. Grosse Pointe Blank [10040 AS]  (144)
  47. Bad Boys [10716]  (144)
  48. Maximum Risk [27416]  (136)
  49. Disclosure [13575]  (135)
  50. Craft, The [82416]  (133)
  51. City of Lost Children, The [40016]  (128)
  52. Fire Down Below [14914]  (128)
  53. WarGames [4714-80]  (120)
  54. Sense and Sensibility [11596]  (120)
  55. Mute Witness [41176]  (119)
  56. Last Action Hero [27936]  (112)
  57. Usual Suspects, The [800638689-1]  (112)
  58. Dracula: Dead and Loving It [80096]  (105)
  59. Day After, The [13755]  (102)
  60. Close Encounters of the Third Kind: Special Edition [76866]  (96)
  61. Double Team [83236]  (96)
  62. Donnie Brasco [82516]  (91)
  63. Gunsmith Cats Chapter: vol.1 [CAVGS/001]  (90)
  64. Ace Ventura: Pet Detective [23000]  (90)
  65. Hook [70606]  (88)
  66. Raw Deal [LVD9545]  (85)
  67. JFK [12306]  (84)
  68. Blade Runner: Special Edition [CC1120L]  (84)
  69. Alien 3 [5593-85]  (84)
  70. Aliens: Special Widescreen Collector's Edition [1504-85]  (80)
  71. Indian in the Cupboard, The [11646]  (78)
  72. Seven Years in Tibet [21816]  (78)
  73. Robocop [ID5168]  (75)
  74. In the Line of Fire [52316]  (72)
  75. Sword and the Sorcerer, The [13-010]  (70)
  76. Man for All Seasons, A [80986]  (70)
  77. Devil's Own, The [82466]  (70)
  78. Lawrence of Arabia [79626]  (70)
  79. Crash: Special Edition [CC1500L]  (70)
  80. Blade Runner: Director's Cut [12682]  (68)
  81. Replacement Killers, The [21626]  (66)
  82. I Know What You Did Last Summer: Special Edition [23926]  (66)
  83. Unforgiven [12531]  (66)
  84. Welcome to the Dollhouse [82566]  (65)
  85. Titanic [LV334812-WS]  (64)
  86. Kate Bush: The Whole Story [080 504-1]  (60)
  87. Specialist, The [13574]  (60)
  88. Jerry Maguire [82536]  (60)
  89. Abyss, The: Special Edition [1988-85]  (60)
  90. Greystoke: The Legend of Tarzan Lord of the Apes [11375 LV]  (56)
  91. Twilight Zone: The Movie [11314 LV]  (55)
  92. Client, The [13233]  (55)
  93. Laserdisc: What it is, How it works [USP-001]  (55)
  94. Yor: The Hunter from the Future [VLD 6070]  (52)
  95. Japan: Oil on Canvas [MP116-15VN]  (52)
  96. At Home with Donald Duck [D61-505]  (52)
  97. Eurythmics: Live [080 220-1]  (50)
  98. Tingler, The [07776]  (50)
  99. Gwendoline (Perils of Gwendoline) [G78F5010]  (50)
  100. Switchblade Sisters: Special Edition [RT1001L]  (48)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1294)
  2. Pioneer USA  (776)
  3. Pioneer Japan  (461)
  4. PDO UK  (364)
  5. 3M or IMATION  (204)
  6. Mitsubishi  (185)
  7. Kuraray  (137)
  8. Technidisc  (109)
  9. Sonopress  (104)
  10. DiscoVision (MCA)  (103)
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.