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What a ridiculous question. Now I have a question for you. Why are you spamming a great site with stupid questions? Is is so you or your friends can answer your own question and try and get an upvote?
This is a bad idea, so becareful. There are many groups on Steemit who check for cheats and spammers and may pay you a visit if you continue.
Please stop now.

Hard Drive - Hard Disk or HDD is the same thing, it is a physical disk that we use to store all the smallest files on our computer.

The difference between hard disk and RAM is that the hard disk is the thing which comes in the store, but RAM comes in handy to run the things stored in that storage.
When we turn off the computer, anything that is found in the RAM gets cleared. But when the computer is off in HDD, the data is not erased.

Most hard disks are 5400 rpm or 7200 amp, obviously, 7200 RMP's hard disk is faster than 5400 rmp.
Whenever we store the data on the Hard Disk, it is stored in a piece, and many times those pieces go into different parts of the Hard Disk. When there is a lot of data, on our hard disk, our computer has a little difficulty in finding things on the hard disk, which makes it slow down.
Whenever you save any file on your computer, that file is saved on your computer's hard drive, if you have interest in parts of the computer then you should definitely read about the hard drive.

Hard Drive - Hard Disk or HDD is a similar thing, it is a physical circle that we use to store all the littlest records in our PC.

The contrast between hard disk and RAM is that, the hard plate is the thing which comes in the store, yet RAM proves to be useful to run the things put away in that capacity.

When we kill the PC, anything that is found in the RAM gets cleared. Yet, when the PC is off in HDD, the information isn't deleted.

There is a plate pivot inside the hard disk, the quicker the plate is speedier, the information can be put away or read quicker. We measure hard plate turn speed in RPM (Revolutions Per Minute). Most hard circles are 5400 rpm or 7200 rmp, clearly 7200 rmp's hard plate is speedier than 5400 rmp.

Hard Disk Drive Is a data storage device used to store and retrieve digital information using disks (discs) coated with magnetic material. Basically, the hard drive functions to store digital data. All data that you store on a computer is on the hard disk. Not just documents, pictures, music and videos. But also your computer's Programs, Preferences, and even Operating Systems are all stored on the computer's hard disk.

If your computer's hard disk is damaged, then you will lose everything. That is the reason most people or companies have a data backup (Data Backup). They have another hard drive and copy all their important files to the hard disk.