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SPIRADISC

Spiradisc

Floppy disk copy protection system

Spiradisc (often misspelled as "Spiradisk") was a copy protection scheme used by Sierra On-Line on their floppy disk releases for the Apple II. The technique

Spiradisc

Lunar Leeper

1982 video game

and Commodore 64. The Apple II version is copy-protected using Sierra's Spiradisc system. The Lunar Leeper character later starred in the 1983 educational

Lunar Leeper

Lunar_Leeper

Ultima II: The Revenge of the Enchantress

1982 video game

original Apple II version of the game was copy-protected using Sierra's new Spiradisc system. The original Apple Ultima II received an audiovisual upgrade in

Ultima II: The Revenge of the Enchantress

Ultima_II:_The_Revenge_of_the_Enchantress

List of copy protection schemes

device can block or restrict recording when the waveform is detected. Spiradisc (Floppy Disk) Writes data on spiraling paths rather than in concentric

List of copy protection schemes

List_of_copy_protection_schemes

Bad sector

Sector of a disk storage unit which is unreadable

command set), also suggest a higher chance of a bad sector in the future. Spiradisc - a copy protection scheme writing sectors on spiraling paths on the disk

Bad sector