The cost of devices such as hard disks which are online media and mandatory in almost every computer system is high and further varies according to the storage space required. RAM chips are also very expensive which is one of the limiting factors in the RAM size of today‘s computers.
2. Easily damaged
Magnetic disks and optical disks are usually very sensitive to handling and are thus easily damaged. For instance, magnetic disks are sensitive to dust, heat and strong magnetic fields which can result in data loss in the disk due to disk damage.