A cewar ƙamus, Hard disk wani tsayayyen faifai Magnetic ne wanda ake amfani da shi wajen adana bayanai a cikin tsarin kwamfuta. Na'urar ma'ajiya ce wacce ba ta da ƙarfi wacce ke da ikon adana ɗimbin bayanan dijital, gami da tsarin aiki, shirye-shiryen software, da fayilolin mai amfani. Hard disks yawanci ana amfani da su a cikin kwamfutoci na sirri, kwamfyutocin tafi-da-gidanka, sabobin, da sauran na'urorin lantarki waɗanda ke buƙatar ma'ajin bayanai masu ƙarfi. Yawanci sun ƙunshi faifai ɗaya ko fiye waɗanda ke jujjuyawa cikin sauri kuma ana samun su ta hanyar karantawa/rubutu kawunan da ke tafiya a saman fayafai.