Hard drives should be stored at 15 to 20 degrees Celsius, without major temperature fluctuations, and away from vibrations, pressure and magnetic fields. Avoid stacking hard drives. At temperatures below 15 to 20 degrees, the lubricant of the media tends to gum up.
In addition, it is best to store hard drives in an airtight and secure manner. Storage boxes such as aluminium crates, protective bags or protective boxes are suitable for this purpose.