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Forum » FORUM » HARDWARE » Anatomia unui hard disk
Anatomia unui hard disk
NMVData: Sâmbătă, 26 Ian 2013, 5:45 PM | Mesaj # 1
Grup: ADMIN
Mesaje: 145
Status: Offline


1. Disc sau discuri neflexibile din metal (platane) acoperite cu un strat de material magnetizabil. Aceste discuri sunt învârtite de un motor ce poate dezvolta o viteză de rotaţie de ordinul miilor de rotaţii pe minut (RPM). În prezent hard disk-urile obişnuite sunt cotate la viteze ce încep de la 7200 de rotaţii pe minut.

2. Braţ deplasabil ce conţine capul de citire/scriere. În cazul în care un hard disk conţine mai multe platane suprapuse fiecare dintre acestea este deservit de un cap de citire/scriere propriu. Activitatea de citire /scriere produce un „bâzâit” specific datorită fenomenelor magnetice implicate în stocarea şi accesarea datelor. Hard disk-urile au devenit cu timpul din ce în ce mai silenţioase, zgomotul produs în timpul funcţionării fiind la unele modele aproape imperceptibil.

3. Un al doilea motor ce poate deplasa capul de citire scriere în orice punct al suprafeţei de stocare.

4. Parte electronică ce controlează activităţile de citire/scriere şi de transferare a datelor dinspre şi către calculator. În componenţa acestei părţi intră şi o cantitate redusă de memorie ultrarapidă de tip cache.

5. Carcasă din metal în care sunt încapsulate componentele mecanice şi o parte din cele electronice. Această carcasă are rolul de a se comporta şi ca un radiator prelunând caldura degajată de discurile ce se rotesc la viteze foarte mari.
Pentru comparaţie, banda unei casete audio se deplasează pe sub capul de citire cu o viteză de aproximativ 5-10 cm pe secundă (~0,3 km/h), în timp viteza de rotaţie a discurilor unui hard disk depăşete şi 136 km/h!


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