The memory inside a PC is blanked every time you switch off the computer, so to save work for future use, you must store it on a hard disk. Because hard disks are basically mechanical devices that work by storing magnetic pulses on to spinning metal plates, they do not rely on electricity to provide safe long time storage. It is therefore possible to unscrew, disconnect and remove a hard disk from one computer and transfer it to another machine, without losing anything stored on it......................................................
