The disk is the slowest part of a PC and the time it takes for the PC  to write to the disk can give the user the impression that the program  is slow because the screen is not updated quickly.
Disk je najpočasnejši del osebnega računalnika in zaradi časa, ki ga računalnik potrebuje za pisanje na disk, uporabnik dobi vtis, da je program počasen, ker zaslon ni hitro posodobljen.