Swapping HDD's

Why can't I simply rip out a HDD from one laptop and put it in another? Why does this not work
Yes they are a very useful option for that, and as back up devices.Westsider wrote:Is the HDD blank? Then you can.
The problem swapping operating system hard drives is that the drivers are specific for one set of hardware.
If you are looking at getting data off a hard drive you can buy a USB dock and plug it into a working computer, then plug the said hard drive into the dock and voila, you can get your data off.