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হার্ডডিস্ক কিভাবে কাজ করে ( Hard Disk - How it works)

1,301 views · Published 11 February 2017 · 6:04 · Indexed 10 November 2026

Channel: dxer manto · 2017 · People & Blogs

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When we save a document, it gets written somewhere "non-volatile" that keeps its state even when the power is off. How does that work for a hard drive?

The hard drive contains a spinning platter with a thin magnetic coating
A "head" moves over the platter, writing 0's and 1's as tiny areas of magnetic North or South on the platter
To read the data back, the head goes to the same spot, notices the North and South spots flying by, and so deduces the stored 0's and 1's
A Modern hard drive can store well over a trillion 0/1 bits per platter so the individual North/South spots are quite small
"Flash" storage is made with chips (no moving parts) and is gradually replacing spinning hard drives like this. Flash chips are what's inside camera SDHC memory cards and USB storage keys.
These video was released under the CC Attribution Sharealike 3.0 license
http://cs.stanford.edu/people/nick/how-hard-drive-works/
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