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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 5520 reports on 3284 titles representing 1.04% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (6765)
  2. Air Force One: Special Edition [71886]  (3549)
  3. Starship Troopers [71716]  (2376)
  4. Contact: Special Edition [15041]  (2376)
  5. Net, The [11616]  (2175)
  6. Under Siege 2: Dark Territory [13665]  (1872)
  7. Ace Ventura: When Nature Calls [23500]  (1836)
  8. Cable Guy, The [82426]  (1664)
  9. Copycat [14168]  (1550)
  10. Men in Black [82656]  (1512)
  11. Lost Highway [ID3946PG]  (1508)
  12. Jumanji [11746]  (1464)
  13. Heavy Metal [74656]  (1456)
  14. Professional, The [74746]  (1357)
  15. Fugitive, The [21000]  (1152)
  16. Fan, The [82476]  (954)
  17. Striptease [84976]  (918)
  18. Shawshank Redemption, The [74596]  (918)
  19. Dante's Peak [43311]  (860)
  20. Game, The [ID4260PG]  (828)
  21. Fifth Element, The [82406]  (798)
  22. Beauty and the Beast: Work in Progress [1591 CS]  (722)
  23. Fargo [800638693-1]  (702)
  24. Demolition Man [12985]  (684)
  25. Batman Returns [15000]  (528)
  26. First Knight [71176]  (448)
  27. Boot, Das (The Boat) [99916]  (420)
  28. Volcano [0603985]  (416)
  29. The Beatles: Let It Be [4508-80]  (416)
  30. Willow [79356]  (406)
  31. Fair Game [14072]  (406)
  32. Dolores Claiborne [59906]  (336)
  33. Bad Boys [10716]  (300)
  34. Barb Wire [800639927-1]  (297)
  35. Gattaca [82646]  (276)
  36. Multiplicity [82446]  (275)
  37. Johnny Mnemonic [73476]  (273)
  38. Star Wars Trilogy: Definitive Collection [0693-84]  (264)
  39. Batman & Robin [16500]  (264)
  40. Hamlet [94996]  (242)
  41. Grumpier Old Men [14191]  (242)
  42. Fire Down Below [14914]  (231)
  43. I Come in Peace [LVD9603]  (230)
  44. WarGames [4714-80]  (200)
  45. Hunchback of Notre Dame, The [7955 AS]  (190)
  46. Aliens: Special Widescreen Collector's Edition [1504-85]  (180)
  47. Maximum Risk [27416]  (180)
  48. Blade Runner: Director's Cut [12682]  (176)
  49. Mute Witness [41176]  (168)
  50. Crimes of Passion: Special Edition [LVD9523]  (168)
  51. Ace Ventura: Pet Detective [23000]  (154)
  52. Desperado: Special Edition [11656]  (153)
  53. Abyss, The: Special Edition [1988-85]  (153)
  54. Tin Cup [14318]  (152)
  55. Double Team [83236]  (144)
  56. Donnie Brasco [82516]  (144)
  57. Anaconda [81756]  (144)
  58. Blade Runner: Special Edition [CC1120L]  (136)
  59. Last Action Hero [27936]  (136)
  60. Usual Suspects, The [800638689-1]  (136)
  61. Disclosure [13575]  (135)
  62. Devil's Own, The [82466]  (133)
  63. Day After, The [13755]  (133)
  64. Alien: Special Widescreen Collector's Edition [1090-85]  (132)
  65. City of Lost Children, The [40016]  (128)
  66. Sense and Sensibility [11596]  (120)
  67. Craft, The [82416]  (119)
  68. Raw Deal [LVD9545]  (114)
  69. I Know What You Did Last Summer: Special Edition [23926]  (112)
  70. Grosse Pointe Blank [10040 AS]  (112)
  71. Muppet Treasure Island [7076 AS]  (108)
  72. Unforgiven [12531]  (104)
  73. Seven Years in Tibet [21816]  (98)
  74. Kate Bush: The Whole Story [080 504-1]  (95)
  75. Excalibur [22030]  (95)
  76. Dracula: Dead and Loving It [80096]  (91)
  77. Jerry Maguire [82536]  (90)
  78. ABBA [74-006]  (90)
  79. Hook [70606]  (88)
  80. Alien 3 [5593-85]  (84)
  81. Video Standard, A [LD-101]  (84)
  82. Tingler, The [07776]  (84)
  83. Boyz N the Hood: Special Edition [CC1289L]  (84)
  84. Titanic [LV334812-WS]  (81)
  85. Few Good Men, A [27896]  (78)
  86. Specialist, The [13574]  (77)
  87. Robocop [ID5168]  (75)
  88. Legends of the Fall [78726]  (72)
  89. In the Line of Fire [52316]  (72)
  90. Adventures of Baron Munchausen, The [76986]  (70)
  91. Lawrence of Arabia [79626]  (70)
  92. Welcome to the Dollhouse [82566]  (70)
  93. Switchblade Sisters: Special Edition [RT1001L]  (70)
  94. Sword and the Sorcerer, The [13-010]  (70)
  95. Hoodlum [ML106282]  (70)
  96. American President, The [80176]  (70)
  97. Dire Straits: Brothers in Arms [080 166-9]  (70)
  98. To Die For [73436]  (66)
  99. Replacement Killers, The [21626]  (66)
  100. JFK [12306]  (65)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1444)
  2. Pioneer USA  (875)
  3. Pioneer Japan  (525)
  4. PDO UK  (504)
  5. 3M or IMATION  (232)
  6. Mitsubishi  (224)
  7. Kuraray  (167)
  8. Technidisc  (128)
  9. DiscoVision (MCA)  (108)
  10. DADC Austria  (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.