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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 5228 reports on 3113 titles representing 1.07% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (5916)
  2. Air Force One: Special Edition [71886]  (3219)
  3. Starship Troopers [71716]  (2240)
  4. Contact: Special Edition [15041]  (2046)
  5. Under Siege 2: Dark Territory [13665]  (1998)
  6. Net, The [11616]  (1988)
  7. Ace Ventura: When Nature Calls [23500]  (1755)
  8. Lost Highway [ID3946PG]  (1620)
  9. Cable Guy, The [82426]  (1550)
  10. Jumanji [11746]  (1440)
  11. Men in Black [82656]  (1430)
  12. Fugitive, The [21000]  (1152)
  13. Copycat [14168]  (1134)
  14. Dante's Peak [43311]  (1034)
  15. Heavy Metal [74656]  (968)
  16. Fan, The [82476]  (954)
  17. Fifth Element, The [82406]  (920)
  18. Professional, The [74746]  (864)
  19. Shawshank Redemption, The [74596]  (833)
  20. Game, The [ID4260PG]  (810)
  21. Beauty and the Beast: Work in Progress [1591 CS]  (779)
  22. Striptease [84976]  (645)
  23. Demolition Man [12985]  (560)
  24. Fargo [800638693-1]  (544)
  25. First Knight [71176]  (540)
  26. Batman Returns [15000]  (465)
  27. Fair Game [14072]  (406)
  28. Boot, Das (The Boat) [99916]  (364)
  29. The Beatles: Let It Be [4508-80]  (360)
  30. Multiplicity [82446]  (348)
  31. Dolores Claiborne [59906]  (336)
  32. Volcano [0603985]  (299)
  33. Barb Wire [800639927-1]  (297)
  34. Willow [79356]  (288)
  35. Johnny Mnemonic [73476]  (273)
  36. Gattaca [82646]  (242)
  37. Fire Down Below [14914]  (231)
  38. I Come in Peace [LVD9603]  (230)
  39. Batman & Robin [16500]  (220)
  40. Maximum Risk [27416]  (210)
  41. Bad Boys [10716]  (210)
  42. Hamlet [94996]  (210)
  43. Grumpier Old Men [14191]  (210)
  44. WarGames [4714-80]  (200)
  45. Hunchback of Notre Dame, The [7955 AS]  (190)
  46. Star Wars Trilogy: Definitive Collection [0693-84]  (190)
  47. Tin Cup [14318]  (189)
  48. Dracula: Dead and Loving It [80096]  (171)
  49. Crimes of Passion: Special Edition [LVD9523]  (168)
  50. Ace Ventura: Pet Detective [23000]  (160)
  51. Abyss, The: Special Edition [1988-85]  (153)
  52. Blade Runner: Director's Cut [12682]  (147)
  53. Anaconda [81756]  (144)
  54. Grosse Pointe Blank [10040 AS]  (144)
  55. Mute Witness [41176]  (140)
  56. Usual Suspects, The [800638689-1]  (136)
  57. Last Action Hero [27936]  (136)
  58. Donnie Brasco [82516]  (136)
  59. Disclosure [13575]  (135)
  60. Day After, The [13755]  (133)
  61. Devil's Own, The [82466]  (133)
  62. Aliens: Special Widescreen Collector's Edition [1504-85]  (120)
  63. Sense and Sensibility [11596]  (120)
  64. Double Team [83236]  (119)
  65. City of Lost Children, The [40016]  (112)
  66. Craft, The [82416]  (112)
  67. Blade Runner: Special Edition [CC1120L]  (105)
  68. Hoodlum [ML106282]  (102)
  69. Desperado: Special Edition [11656]  (98)
  70. Excalibur [22030]  (95)
  71. Kate Bush: The Whole Story [080 504-1]  (95)
  72. Gunsmith Cats Chapter: vol.1 [CAVGS/001]  (90)
  73. Hook [70606]  (88)
  74. Raw Deal [LVD9545]  (85)
  75. Tingler, The [07776]  (84)
  76. Boyz N the Hood: Special Edition [CC1289L]  (84)
  77. Alien 3 [5593-85]  (84)
  78. Unforgiven [12531]  (84)
  79. Titanic [LV334812-WS]  (81)
  80. Indian in the Cupboard, The [11646]  (78)
  81. Few Good Men, A [27896]  (78)
  82. Seven Years in Tibet [21816]  (78)
  83. Robocop [ID5168]  (75)
  84. In the Line of Fire [52316]  (72)
  85. Alien: Special Widescreen Collector's Edition [1090-85]  (72)
  86. Legends of the Fall [78726]  (72)
  87. Dire Straits: Brothers in Arms [080 166-9]  (70)
  88. American President, The [80176]  (70)
  89. Sword and the Sorcerer, The [13-010]  (70)
  90. Lawrence of Arabia [79626]  (70)
  91. Replacement Killers, The [21626]  (66)
  92. I Know What You Did Last Summer: Special Edition [23926]  (66)
  93. ABBA [74-006]  (65)
  94. Man for All Seasons, A [80986]  (65)
  95. Welcome to the Dollhouse [82566]  (65)
  96. Close Encounters of the Third Kind: Special Edition [76866]  (65)
  97. Terminator, The [ID2940NSB]  (65)
  98. JFK [12306]  (65)
  99. Dschungel-Olympiade, Die (Animalympics) [3114-4]  (60)
  100. Specialist, The [13574]  (60)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1383)
  2. Pioneer USA  (835)
  3. Pioneer Japan  (506)
  4. PDO UK  (434)
  5. 3M or IMATION  (229)
  6. Mitsubishi  (204)
  7. Kuraray  (154)
  8. Technidisc  (120)
  9. Sonopress  (109)
  10. DiscoVision (MCA)  (106)
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.