To increase the physical storage capacity of the computer, or to create redundancy in RAID configurations for data protection.
If you mean between hard drives and ssd's (solid state drives), then you need to read the wikipedia page on Solid State Drives, it has a comparison of the two technologies.
You could format two hard drives at same time but both need to be connected by the sata connector cable.
because the drives are two hard on the car or there car is to old and they need to get a new one
You need two cables called IDE cables. Typically these cables have the ability to connect two hard drives or two CD DVD roms. So just find two IDE cables and you can conect what you need to connect.
Well if you don't need a CD Drive unplug it and attach the two new drives to that cable. You could add another IDE controller in an empty PCI slot, then you could add more drives to it.
method of storing data on two or more hard drives that work together?
Hard drives are made separate from a computer. They can be removed and replaced. There are two types of hard drives, those that have crashed and those that have not yet crashed. Keep your drive backed up so that when you need your hard drives changed your data will be saved. There is usually a simple way to get your hard drive out and a new one installed. The difficult part is putting your system back on. Keep your instruction manual!
Yes, you can. If your computer has more sata ports you can use then to connect more hard drives.
There are many types of storage media, two of them are USBs, or thumb drives, and external hard drives.
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One can sell HP hard drives at multiple online retailers. Two of the most popular retailers would be eBay and Best Buy. One can also sell a used HP hard drive to Power Source.