A Direct Access Terabit Archival Memory.

H. G. Heard: A Direct Access Terabit Archival Memory. VLDB 1977: 254-258
  author    = {H. G. Heard},
  title     = {A Direct Access Terabit Archival Memory},
  booktitle = {Proceedings of the Third International Conference on Very Large
               Data Bases, October 6-8, 1977, Tokyo, Japan},
  publisher = {IEEE Computer Society},
  year      = {1977},
  pages     = {254-258},
  ee        = {db/conf/vldb/Heard77.html},
  crossref  = {DBLP:conf/vldb/77},
  bibsource = {DBLP,}


This paper addresses recent developments in terabit-level laser archival memory storage technology. The laser memory employs a 500 milliwatt 514.5 nanometer wavelength argon-ion optical laser source to melt permanent bit patterns into a rhodium-coated flexible plastic data storage strip. The same laser, operated at an order of magnitude less power output, is used to read the stored binary data. Information densities of 2.5 x 107 bits per square inch are achieved as limited by tracking and beam spot size. Because each data record is permanent, truly archival storage (~25 years) is only limited by dust build-up. Extensive error correction codes enable performance at the 10-l0 bit error rate level. The system is supported by extensive software that provides call-by-name file access. Operating at peak data rates of 5 megabits/second, the system behaves as an on-line direct-access file, with an on-line capacity equivalent to several thousand 1600 BP1 2400-foot rolls of magnetic tape. Worst case access time to any record is of the order of seconds. Average user-data transfer rates can be as high as 2.86 megabits per second with full data redundancy.

Copyright © 1977 by The Institute of Electrical and Electronic Engineers, Inc. (IEEE). Abstract used with permission.

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Proceedings of the Third International Conference on Very Large Data Bases, October 6-8, 1977, Tokyo, Japan. IEEE Computer Society 1977
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