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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 5286 reports on 3155 titles representing 1.05% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (5916)
  2. Air Force One: Special Edition [71886]  (3420)
  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]  (1638)
  8. Lost Highway [ID3946PG]  (1620)
  9. Cable Guy, The [82426]  (1550)
  10. Jumanji [11746]  (1525)
  11. Men in Black [82656]  (1430)
  12. Copycat [14168]  (1210)
  13. Fugitive, The [21000]  (1152)
  14. Heavy Metal [74656]  (1081)
  15. Fan, The [82476]  (954)
  16. Professional, The [74746]  (950)
  17. Fifth Element, The [82406]  (920)
  18. Dante's Peak [43311]  (860)
  19. Shawshank Redemption, The [74596]  (833)
  20. Beauty and the Beast: Work in Progress [1591 CS]  (779)
  21. Game, The [ID4260PG]  (748)
  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. Volcano [0603985]  (336)
  31. Dolores Claiborne [59906]  (336)
  32. Barb Wire [800639927-1]  (297)
  33. Willow [79356]  (288)
  34. Multiplicity [82446]  (275)
  35. Johnny Mnemonic [73476]  (273)
  36. Batman & Robin [16500]  (264)
  37. Gattaca [82646]  (242)
  38. Grumpier Old Men [14191]  (242)
  39. Fire Down Below [14914]  (231)
  40. I Come in Peace [LVD9603]  (230)
  41. Bad Boys [10716]  (210)
  42. Hamlet [94996]  (210)
  43. WarGames [4714-80]  (200)
  44. Star Wars Trilogy: Definitive Collection [0693-84]  (190)
  45. Hunchback of Notre Dame, The [7955 AS]  (190)
  46. Tin Cup [14318]  (189)
  47. Maximum Risk [27416]  (180)
  48. Aliens: Special Widescreen Collector's Edition [1504-85]  (180)
  49. Dracula: Dead and Loving It [80096]  (171)
  50. Crimes of Passion: Special Edition [LVD9523]  (168)
  51. Ace Ventura: Pet Detective [23000]  (160)
  52. Abyss, The: Special Edition [1988-85]  (153)
  53. Blade Runner: Director's Cut [12682]  (147)
  54. Anaconda [81756]  (144)
  55. Grosse Pointe Blank [10040 AS]  (144)
  56. Mute Witness [41176]  (140)
  57. Last Action Hero [27936]  (136)
  58. Donnie Brasco [82516]  (136)
  59. Usual Suspects, The [800638689-1]  (136)
  60. Disclosure [13575]  (135)
  61. Day After, The [13755]  (133)
  62. Devil's Own, The [82466]  (133)
  63. Desperado: Special Edition [11656]  (120)
  64. Sense and Sensibility [11596]  (120)
  65. Double Team [83236]  (119)
  66. City of Lost Children, The [40016]  (112)
  67. Craft, The [82416]  (112)
  68. Blade Runner: Special Edition [CC1120L]  (105)
  69. Hoodlum [ML106282]  (102)
  70. Excalibur [22030]  (95)
  71. Kate Bush: The Whole Story [080 504-1]  (95)
  72. Gunsmith Cats Chapter: vol.1 [CAVGS/001]  (90)
  73. Alien: Special Widescreen Collector's Edition [1090-85]  (90)
  74. Hook [70606]  (88)
  75. Raw Deal [LVD9545]  (85)
  76. Tingler, The [07776]  (84)
  77. Boyz N the Hood: Special Edition [CC1289L]  (84)
  78. Alien 3 [5593-85]  (84)
  79. Unforgiven [12531]  (84)
  80. Titanic [LV334812-WS]  (81)
  81. Indian in the Cupboard, The [11646]  (78)
  82. Seven Years in Tibet [21816]  (78)
  83. Few Good Men, A [27896]  (78)
  84. Robocop [ID5168]  (75)
  85. Muppet Treasure Island [7076 AS]  (75)
  86. In the Line of Fire [52316]  (72)
  87. Legends of the Fall [78726]  (72)
  88. American President, The [80176]  (70)
  89. Dire Straits: Brothers in Arms [080 166-9]  (70)
  90. Sword and the Sorcerer, The [13-010]  (70)
  91. Lawrence of Arabia [79626]  (70)
  92. Replacement Killers, The [21626]  (66)
  93. To Die For [73436]  (66)
  94. I Know What You Did Last Summer: Special Edition [23926]  (66)
  95. Man for All Seasons, A [80986]  (65)
  96. Close Encounters of the Third Kind: Special Edition [76866]  (65)
  97. Welcome to the Dollhouse [82566]  (65)
  98. Terminator, The [ID2940NSB]  (65)
  99. ABBA [74-006]  (65)
  100. JFK [12306]  (65)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1393)
  2. Pioneer USA  (834)
  3. Pioneer Japan  (508)
  4. PDO UK  (448)
  5. 3M or IMATION  (228)
  6. Mitsubishi  (211)
  7. Kuraray  (160)
  8. Technidisc  (122)
  9. Sonopress  (109)
  10. DiscoVision (MCA)  (105)
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.