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Hard drive converts Logical Binary digits ( Zeroes andOnes) into the state that the media used on Hard drive can translate as Zero or One. There are three predominant methods of states used for storing Binary digits over the media, they are as:

1. MagneticHard Disk Drive: Stores Binary digits through Polarity methods (North & South).

2. Flash Drives: StoresBinary digits in form ofcharge stored in Floating gate.(Whether Floating Gate is charged (have electrons)or discharged (no electrons))

3. Optical Disks (CDs, DVDs & BDs): Stores Binary digits in Form of Lands & Pits.

(Microscopically seen small area etched is Pit and unetched is Land).

These all methods are understood orcreated/alteredby the sensor on the disk. Then firmware on disk makes them digitally meaningful and presents it the computer attached to. HardDrive saves Information by allocating of available space on disk managed by Filesystem employed by the Operating System such as FAT32 & NTFS by Microsoft Windows.

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Q: How does the Hard Drive save information?
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