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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 5968 reports on 3517 titles representing 1.01% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (6318)
  2. Air Force One: Special Edition [71886]  (3895)
  3. Starship Troopers [71716]  (2485)
  4. Cable Guy, The [82426]  (2280)
  5. Contact: Special Edition [15041]  (2208)
  6. Copycat [14168]  (2059)
  7. Net, The [11616]  (2016)
  8. Jumanji [11746]  (1904)
  9. Men in Black [82656]  (1885)
  10. Ace Ventura: When Nature Calls [23500]  (1876)
  11. Under Siege 2: Dark Territory [13665]  (1872)
  12. Heavy Metal [74656]  (1456)
  13. Lost Highway [ID3946PG]  (1350)
  14. Shawshank Redemption, The [74596]  (1298)
  15. Professional, The [74746]  (1254)
  16. Fugitive, The [21000]  (1225)
  17. Striptease [84976]  (1166)
  18. Beauty and the Beast: Work in Progress [1591 CS]  (924)
  19. Dante's Peak [43311]  (860)
  20. Fifth Element, The [82406]  (860)
  21. Fargo [800638693-1]  (840)
  22. Game, The [ID4260PG]  (810)
  23. Fan, The [82476]  (752)
  24. Demolition Man [12985]  (741)
  25. Volcano [0603985]  (646)
  26. Batman Returns [15000]  (528)
  27. Boot, Das (The Boat) [99916]  (435)
  28. Willow [79356]  (420)
  29. The Beatles: Let It Be [4508-80]  (416)
  30. Fair Game [14072]  (406)
  31. Dolores Claiborne [59906]  (377)
  32. First Knight [71176]  (348)
  33. Star Wars Trilogy: Definitive Collection [0693-84]  (336)
  34. I Come in Peace [LVD9603]  (336)
  35. Gattaca [82646]  (325)
  36. Johnny Mnemonic [73476]  (308)
  37. Bad Boys [10716]  (300)
  38. Barb Wire [800639927-1]  (297)
  39. Multiplicity [82446]  (275)
  40. Batman & Robin [16500]  (264)
  41. Fire Down Below [14914]  (264)
  42. Abyss, The: Special Edition [1988-85]  (242)
  43. Hamlet [94996]  (242)
  44. Grumpier Old Men [14191]  (242)
  45. Hunchback of Notre Dame, The [7955 AS]  (231)
  46. Tin Cup [14318]  (230)
  47. Maximum Risk [27416]  (220)
  48. Mute Witness [41176]  (216)
  49. I Know What You Did Last Summer: Special Edition [23926]  (209)
  50. Anaconda [81756]  (209)
  51. Ace Ventura: Pet Detective [23000]  (200)
  52. Aliens: Special Widescreen Collector's Edition [1504-85]  (180)
  53. Blade Runner: Special Edition [CC1120L]  (171)
  54. Blade Runner: Director's Cut [12682]  (168)
  55. Craft, The [82416]  (160)
  56. Alien: Special Widescreen Collector's Edition [1090-85]  (156)
  57. Double Team [83236]  (152)
  58. WarGames [4714-80]  (147)
  59. Last Action Hero [27936]  (136)
  60. Disclosure [13575]  (135)
  61. Crimes of Passion: Special Edition [LVD9523]  (126)
  62. Sense and Sensibility [11596]  (120)
  63. Jerry Maguire [82536]  (119)
  64. Raw Deal [LVD9545]  (114)
  65. Adventures of Baron Munchausen, The [76986]  (114)
  66. Grosse Pointe Blank [10040 AS]  (112)
  67. Dracula: Dead and Loving It [80096]  (112)
  68. Usual Suspects, The [800638689-1]  (112)
  69. Donnie Brasco [82516]  (112)
  70. Day After, The [13755]  (108)
  71. Now You Can See the Music [080 546-1]  (108)
  72. Muppet Treasure Island [7076 AS]  (108)
  73. Desperado: Special Edition [11656]  (104)
  74. Specialist, The [13574]  (104)
  75. To Die For [73436]  (104)
  76. Unforgiven [12531]  (104)
  77. City of Lost Children, The [40016]  (98)
  78. Few Good Men, A [27896]  (98)
  79. Lethal Weapon 2 [11876]  (98)
  80. Devil's Own, The [82466]  (96)
  81. Kate Bush: The Whole Story [080 504-1]  (95)
  82. Gunsmith Cats Chapter: vol.1 [CAVGS/001]  (90)
  83. ABBA [74-006]  (90)
  84. Safe [11846]  (90)
  85. Hoodlum [ML106282]  (90)
  86. Hook [70606]  (88)
  87. Boyz N the Hood: Special Edition [CC1289L]  (84)
  88. Lethal Weapon 3 [12475]  (84)
  89. Close Encounters of the Third Kind: Special Edition [76866]  (84)
  90. Video Standard, A [LD-101]  (84)
  91. Titanic [LV334812-WS]  (81)
  92. Crash: Special Edition [CC1500L]  (80)
  93. JFK [12306]  (78)
  94. Seven Years in Tibet [21816]  (78)
  95. Robocop [ID5168]  (75)
  96. American President, The [80176]  (75)
  97. Switchblade Sisters: Special Edition [RT1001L]  (70)
  98. Sword and the Sorcerer, The [13-010]  (70)
  99. Pavarotti & Friends: For War Child [440 074 202-1]  (70)
  100. Dire Straits: Brothers in Arms [080 166-9]  (70)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1496)
  2. Pioneer USA  (935)
  3. PDO UK  (589)
  4. Pioneer Japan  (572)
  5. 3M or IMATION  (259)
  6. Mitsubishi  (238)
  7. Kuraray  (181)
  8. Technidisc  (134)
  9. DADC Austria  (125)
  10. DiscoVision (MCA)  (114)
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.