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Text File  |  1987-07-22  |  1KB  |  36 lines
  1. üDDT¡גEEPגISKקESTER Çbyפichardיarsmakers
  2.  
  3. When⇩I⇩recently⇩visited⌠heבCV⇩(that,⇩my⇩friends,⇩it⇩the
  4. Computer⇩Clubשeldhoven,⇩one∩f⌠heπosiestπomputer⇩clubs⇩in
  5. Southernמetherlands)≤omeone¿his∈ame≤lippedϕy⇩mind,⇩sorry)
  6. gaveϕe⌠heΘdea⌠o≈riteβ≡rogram⌠hatπan⌠estσvery⇩data-bit
  7. ofβΣisk¡βlso≈hen⌠heΣisk≈asβlready≈ritten∩n.זeπame⌡p
  8. with⌠heβbove∈ameβs≈ell¿through∮ack∩f≤heerπreativity,⇩I
  9. would∈everΦaveΓeenβble⌠o⌠hink∩f≤omething±uite∮ikeΘt⇩-
  10. especially⇩when⇩writing'n'programming∩nβœ0⇩degrees⇩Celcius
  11. attic).
  12.  
  13. The≡rogramΩustβsks∙ou⌠oΘnsert⌠heΣisk⌠oΓe⇩tested,⇩then
  14. checks⌠heΓootsector¿toτet∈umber∩f≤ides,⌠racksβnd≤ectors
  15. per⇩track)βnd≤tarts⌠estingσvery≤ingleΓitΘt⇩can⇩normally
  16. read.קheגeepגiskקesterπannot⌠est≡rotectedΣisks¿e.g.≈ith
  17. checksum⇩errors⇩or≤omething∩f⌠heδind⇩deliberately⇩brought
  18. upon⇩it)¡⌠heseσrroneous⌠racks≈ill≤implyΓeΘgnoredΘn⇩the
  19. test.
  20.  
  21.  
  22.  
  23. HowΣoesΘt≈ork?
  24.  
  25. Theβctual⌠est≥outineΘsβctuallyϕade⌡p∮ike⌠his:
  26.  
  27. 1¡פeadβ≤ector
  28. 2¡ןorβllΓytes≈ithØ55¿everyΓitΘsΘnverted)
  29. 3¡תrite⌠he≤ectorΓack
  30. 4¡פeadΘtβgainβndπompareΘt≈ith⌠he≤ectorβsΘt≤houldΓe
  31. 5¡חfσverythingΘsנK,⌠hen⌠he≈hole⌠hings≤houldΓeןor-ed
  32. ⇦againβnd≈rittenΓack
  33.  
  34. This≈ay,σvery≤ingleΓit∩f⌠heΣiskΘs⌠ested.
  35.  
  36.