Three years ●●●●●●ene ●●●●●● ●●●●●●c C●●●●●● hard disk ●●●●●● have the ●●●●●●y to store vast ●●●●●●s of data but last ●●●●●●y ten years at room ●●●●●●ature, ●●●●●●e their ●●●●●●ic ●●●●●● ●●●●●●r is low so that the ●●●●●●ation is lost after a ●●●●●● of time.
