Sararin diski yana nufin adadin ƙarfin ajiya da ake samu a kan rumbun kwamfutarka ko wata na'urar ajiya, yawanci ana auna shi da bytes, kilobytes (KB), megabytes (MB), gigabytes (GB), ko terabytes (TB). Wurin da ke kan faifai ne ke samuwa don adana fayilolin bayanai, aikace-aikace, tsarin aiki, da sauran software. Ana amfani da kalmar “disk” sau da yawa tare da “storage na’urar” ko “hard drive,” kuma kalmar “space” tana nufin adadin da ake da shi a cikin na’urar.