Formatting a hard drive is basically making it brand new. When it is formatted, all of the data is cleared. Compare it to your phone. When you got it, you had no pictures, music, or other data on it. After a while, like a hard drive, your phone gains new data and it's not in the same state as it originally was brand new. When it's formatted, it's reset back to default as a hard drive would be and cleared out so that you can reuse it. Formatting is good once in a while.
Of course, copy all your programs and files you need from the old hard drive and put it on your new hard drive BEFORE formatting the old hard drive. Formatting your hard drive will mean losing everything and a slim chance of getting it all back.
You could format two hard drives at same time but both need to be connected by the sata connector cable.
By formatting the hard drive.
You can completely clear your external hard drive by formatting it.
Yes.
Yes, formatting a computer hard drive will delete the operating system.
Yes.
Yes, Surely it will remove everything on hard drive. Formatting a hard drive means to remove everything on hard drive. If you are formatting only a specific drive like C:\ or D:\ then the data in only that drive will be removed.
It wipes out data on the hard drive disk.
Formatting, there's no easier way to clean a Hard drive as new like formatting
There is difference between SATA and PATA HDD but no difference between the formatting..
Formatting a hard drive or memory card means to wipe it clean and prepare it for fresh data.