Primary key is the key that is actually chosen, for example a social security number.
There is also a unique key, say our finger prints! they also uniquely identify humans, but usually we prefer to use social security number when we list people (a unique key could be a primary key if we chose so)
We could also identify people by their social security number and a name, but this is unnecessary, as social security number already gives a full identification. Such a reduntant key is called super key.
Concentric circles on a disk platter where data is stored is called Tracks
The new file system developed for Windows Server 2012 is called Resilient File System (ReFS). It allows increased stability for disk storage and improved features for data recovery and error checking
<em> where the attacker secretly relays and possibly alters the communications between two parties who believe that they are directly communicating with each other.</em>
Answer:An operating system, or "OS," is software that communicates with the hardware and allows other programs to run. It is comprised of system software, or the fundamental files your computer needs to boot up and function.
