- Vacuum tube memory
- A Williams tube used a cathode ray tube, and a Selectron tube used a large vacuum tube to store information. These primary storage devices were short-lived in the market, since Williams tube was unreliable and the Selectron tube was expensive.
- 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.
- Optical tape
- is a medium for optical storage generally consisting of a long and narrow strip of plastic onto which patterns can be written and from which the patterns can be read back. It shares some technologies with cinema film stock and optical discs, but is compatible with neither. The motivation behind developing this technology was the possibility of far greater storage capacities than either magnetic tape or optical discs.
- Phase-change memory
- uses different mechanical phases of Phase Change Material to store information in an X-Y addressable matrix, and reads the information by observing the varying electrical resistance of the material. Phase-change memory would be non-volatile, random-access read/write storage, and might be used for primary, secondary and off-line storage. Most rewritable and many write once optical disks already use phase change material to store information.
- Holographic data storage
- stores information optically inside crystals or photopolymers. Holographic storage can utilize the whole volume of the storage medium, unlike optical disc storage which is limited to a small number of surface layers. Holographic storage would be non-volatile, sequential access, and either write once or read/write storage. It might be used for secondary and off-line storage. See Holographic Versatile Disc (HVD).
- Molecular memory
- stores information in polymer that can store electric charge. Molecular memory might be especially suited for primary storage. The theoretical storage capacity of molecular memory is 10 terabits per square inch.
Other articles related to "uncommon":
... Species Name Status Notes Distribution Eastern pipistrelle Pipistrellus subflavus Uncommon State-wide Big brown bat Eptesicus fuscus Common State-wide Evening bat Nycticeius ...
3 1 ... a b c d e f g h Polish Defense The remaining semi-closed openings are uncommon ... The Queen's Knight Defense is an uncommon opening that often transposes to the Nimzowitsch Defence after 1.d4 Nc6 2.e4 or the Chigorin Defense after 2.c4 d5, although it can lead to unique lines, for example ...
... Uncommon means a species is likely to be seen only monthly in its appropriate season and habitat, though it may be locally common ... name Genus and Species Abundance Picture Jefferson Salamander Ambystoma jeffersonianum Uncommon Spotted Salamander Ambystoma maculatum Uncommon True Toads (Bufonidae) American ...
... Giant Frog (Limnonectes blythii) - Uncommon - Forests Malesian Frog (Limnonectes malesianus) - Uncommon - Forests Masked Swamp Frog (Limnonectes paramacrodon) - Uncommon - Swamp Rhinoceros Frog (Limnonectes ...
... Partridge* Margaroperdix madagascarensis Uncommon resident, LC Common Quail Coturnix coturnix Uncommon resident, LC Harlequin Quail Coturnix delegorguei Uncommon visitor, LC ...
Famous quotes containing the word uncommon:
“May not the complaint, that common people are above their station, often take its rise in the fact of uncommon people being below theirs?”
—Charles Dickens (18121870)
“As uncommon a thing as true love is, it is yet easier to find than true friendship.”
—François, Duc De La Rochefoucauld (16131680)
“You must labour to acquire that great and uncommon talent of hating with good breeding, and loving with prudence; to make no quarrel irreconcilable by silly and unnecessary indications of anger; and no friendship dangerous, in care it breaks, by a wanton, indiscreet, and unreserved confidence.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (16941773)