Molecular memory is a term for data storage technologies that use molecular species as the data storage element, rather than e.g. circuits, magnetics, inorganic materials or physical shapes. The molecular component can be described as a molecular switch, and may perform this function by any of several mechanisms, including charge storage, photochromism, or changes in capacitance. In a perfect molecular memory device, each individual molecule contains a bit of data, leading to massive data capacity. However, practical devices are more likely to use large numbers of molecules for each bit, in the manner of 3D optical data storage (many examples of which can be considered molecular memory devices). The term "molecular memory" is most often used to mean indicate very fast, electronically addressed solid-state data storage, as is the term computer memory. At present, molecular memories are still found only in laboratories.
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... One approach to molecular memories is based on special compounds such as porphyrin-based polymers which are capable of storing electric charge ... unit area than with conventional DRAM memory, thus potentially leading to smaller and cheaper integrated circuits ... and a number of companies (Hewlett Packard, ZettaCore) have announced work on molecular memories, which some hope will supplant DRAM memory as the lowest cost technology ...
... Vacuum tube memory A Williams tube used a cathode ray tube, and a Selectron tube used a large vacuum tube to store information ... Electro-acoustic memory Delay line memory used sound waves in a substance such as mercury to store information ... Delay line memory was dynamic volatile, cycle sequential read/write storage, and was used for primary storage ...
Famous quotes containing the word memory:
“Intelligence is the wife, imagination is the mistress, memory is the servant.”
—Victor Hugo (18021885)