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Informações adicionais
Tipos de disco
Existem dois tipos de MD: pré-gravado
(pre-mastered) e gravável (por gravar).
Os MDs pré-gravados não podem ser
gravados várias vezes como acontece
com as cassetes. Para gravar, tem de
utilizar um a “MD gravável”.
MD Pré-gravados (pre-mastered)
A gravação e reprodução dos MDs pré-
gravados é semelhante à dos CDs
normais. U raio laser foca os “pits” na
superfície do MD e reflecte a informação
para a lente do gravador. O gravador
descodifica os sinais e volta a reproduzi-
los sob a forma de música.
MDs graváveis
Os Mds graváveis, que utilizam uma
tecnologia óptico-magnética (MO),
podem ser gravados quantas vezes
quiser. O laser existente no interior do
gravador aquece o MD,
desmagnetizando a sua camada
magnética. Depois, o gravador aplica
um campo magnético à camada. Este
campo magnético corresponde com
exactidão aos sinais de audio gerados
pela fonte ligada. (As polaridades norte
e sul equiparam-se ao “1” e “0” digital).
O MD desmagnetizado adopta a
polaridade do campo magnético,
criando um MD gravado.
Familiarizar-se com o MD
Estrutura
O Minidisco de 2,5 polegadas (MD) é
compacto é fácil de manusear
requerendo menos cuidados pois está
dentro de uma cartridge de plástico
semelhante a uma disquete de 3,5
polegadas (consulte as figuras abaixo).
Peças de um MiniDisc
Cartridge de
plástico
Disco
Protecção
metálica
continua
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