bubble memory

In computing, a memory device based on the creation of small ‘bubbles’ on a magnetic surface. Bubble memories typically store up to 4 megabits (4 million bits) of information. They are not sensitive to shock and vibration, unlike other memory devices such as disk drives, yet, like magnetic disks, they are nonvolatile and do not lose their information when the computer is switched off. However, in spite of these advantages, the advent of much faster and higher capacity hard disks has rendered bubble memory almost obsolete.