eBay.com is a great website to find used hard drives at various price ranges. Craigslist.com is another website to check out if you are wishing to buy locally.
Discounted or used portable hard drives can be purchased at several locations. Some places one may be able to purchase a discounted or used hard drive include Amazon, eBay, and Tech Bargains.
They both... used as storage
Encrypting hard drives
Discs and SSDs Solid State Drives
SCSI is most commonly used for hard disks and tape drives, but it can also be used to connect a wide range of other devices, including scanners and DC drives.
Hard drives now are pretty robust. You should try not to move the laptop when it is on but it really should not hurt the hard drive.
bitlocker
SMART
External hard drives are used for storing documents, pictures, videos and any other computer files. The external hard drive can be plugged into any computer so it makes the files more portable. Many people use external hard drives as a way of backing up files.
Enhanced Integrated Drive Electronics (EIDE)
Not all portable hard drives work with every laptop. Some portable hard drives are formated for specific types of laptops. For example a portable hard drive that is formated for a Mac cannot be used with a windows laptop
Yes, They are used to move the hard drives. The hard drives spin very fast, and they use magnets to achieve that speed. just don't hold a magnet 2 th computr or u will end up with a messed up / not working computr : /