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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 4304 reports on 2711 titles representing 1.02% of total collections
Top 100 LDs
(realtime)
  1. Eraser [14202]  (4242)
  2. Air Force One: Special Edition [71886]  (1664)
  3. Contact: Special Edition [15041]  (1534)
  4. Under Siege 2: Dark Territory [13665]  (1364)
  5. Lost Highway [ID3946PG]  (1320)
  6. Starship Troopers [71716]  (1296)
  7. Cable Guy, The [82426]  (1196)
  8. Men in Black [82656]  (1012)
  9. Net, The [11616]  (980)
  10. Ace Ventura: When Nature Calls [23500]  (966)
  11. Heavy Metal [74656]  (840)
  12. Professional, The [74746]  (782)
  13. Fugitive, The [21000]  (740)
  14. Copycat [14168]  (714)
  15. Dante's Peak [43311]  (702)
  16. Fan, The [82476]  (660)
  17. Fifth Element, The [82406]  (646)
  18. Striptease [84976]  (645)
  19. Jumanji [11746]  (608)
  20. Beauty and the Beast: Work in Progress [1591 CS]  (510)
  21. Shawshank Redemption, The [74596]  (507)
  22. Game, The [ID4260PG]  (416)
  23. Boot, Das (The Boat) [99916]  (390)
  24. Fargo [800638693-1]  (378)
  25. First Knight [71176]  (360)
  26. Batman Returns [15000]  (338)
  27. Multiplicity [82446]  (308)
  28. The Beatles: Let It Be [4508-80]  (297)
  29. Fair Game [14072]  (288)
  30. Dolores Claiborne [59906]  (275)
  31. Barb Wire [800639927-1]  (230)
  32. Demolition Man [12985]  (220)
  33. Batman & Robin [16500]  (220)
  34. Hamlet [94996]  (210)
  35. Grumpier Old Men [14191]  (210)
  36. Johnny Mnemonic [73476]  (209)
  37. Volcano [0603985]  (200)
  38. Star Wars Trilogy: Definitive Collection [0693-84]  (171)
  39. Tin Cup [14318]  (160)
  40. Last Action Hero, The [27936]  (144)
  41. Grosse Pointe Blank [10040 AS]  (144)
  42. Gattaca [82646]  (136)
  43. I Come in Peace [LVD9603]  (133)
  44. City of Lost Children, The [40016]  (128)
  45. Willow [79356]  (120)
  46. Anaconda [81756]  (120)
  47. Crimes of Passion: Special Edition [LVD9523]  (119)
  48. Disclosure [13575]  (112)
  49. Hunchback of Notre Dame, The [7955 AS]  (112)
  50. Craft, The [82416]  (102)
  51. Day After, The [13755]  (102)
  52. Man for All Seasons, A [80986]  (96)
  53. Close Encounters of the Third Kind: Special Edition [76866]  (96)
  54. Gunsmith Cats Chapter: vol.1 [CAVGS/001]  (90)
  55. Hook [70606]  (88)
  56. Raw Deal [LVD9545]  (85)
  57. JFK [12306]  (84)
  58. Alien 3 [5593-85]  (84)
  59. Maximum Risk [27416]  (84)
  60. Aliens: Special Widescreen Collector's Edition [1504-85]  (80)
  61. Seven Years in Tibet [21816]  (78)
  62. Dracula: Dead and Loving It [80096]  (78)
  63. Indian in the Cupboard, The [11646]  (78)
  64. Sense and Sensibility [11596]  (77)
  65. Donnie Brasco [82516]  (72)
  66. In the Line of Fire [52316]  (72)
  67. Crash: Special Edition [CC1500L]  (70)
  68. Usual Suspects, The [800638689-1]  (70)
  69. Double Team [83236]  (70)
  70. Blade Runner: Director's Cut [12682]  (68)
  71. Replacement Killers, The [21626]  (66)
  72. Mute Witness [41176]  (60)
  73. Lethal Weapon 3 [12475]  (60)
  74. Ace Ventura: Pet Detective [23000]  (60)
  75. Bad Boys [10716]  (60)
  76. Client, The [13233]  (55)
  77. Yor: The Hunter from the Future [VLD 6070]  (52)
  78. Devil's Own, The [82466]  (52)
  79. Japan: Oil on Canvas [MP116-15VN]  (52)
  80. I Know What You Did Last Summer: Special Edition [23926]  (50)
  81. Gwendoline (Perils of Gwendoline) [G78F5010]  (50)
  82. Switchblade Sisters: Special Edition [RT1001L]  (48)
  83. Lawrence of Arabia [79626]  (48)
  84. Specialist, The [13574]  (45)
  85. Fire Down Below [14914]  (45)
  86. Abyss, The: Special Edition [1988-85]  (45)
  87. Sleepless in Seattle [52416]  (44)
  88. Billy Joel: Live From Long Island [6297-80]  (44)
  89. Welcome to the Dollhouse [82566]  (44)
  90. Close to You: Remembering the Carpenters [CLV7278]  (44)
  91. Pavarotti & Friends: For War Child [440 074 202-1]  (44)
  92. Now You Can See the Music [080 546-1]  (44)
  93. Alien: Special Widescreen Collector's Edition [1090-85]  (42)
  94. Superman: The Movie [1013 LV]  (40)
  95. Jerry Maguire [82536]  (40)
  96. Unforgiven [12531]  (40)
  97. Adventures of Baron Munchausen, The [76986]  (40)
  98. Crumb [10696]  (40)
  99. Class of 1999 [PCLV-10002]  (40)
  100. Virgin Queen of St. Francis High [ID5273ME]  (39)
"Score" is defined as (Rot Level x Nb of Reports)
Top 10 Makers
(realtime)
  1. DADC USA  (1179)
  2. Pioneer USA  (684)
  3. Pioneer Japan  (427)
  4. PDO UK  (319)
  5. 3M or IMATION  (183)
  6. Mitsubishi  (172)
  7. Kuraray  (122)
  8. Technidisc  (105)
  9. Sonopress  (98)
  10. DiscoVision (MCA)  (88)
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.