Found this 'gem' on http://www.research.ibm.com about a new HD storage technology. Extremely disappointing. I also clicked the Japanese language page and there I recognized the same measuring unit used in the English text below: 17 and 100 Gb/in2. It really seems that IBM is not moving towards SI at all! A new technology and they go on using ifp trash in English and Japanese! Not before HD storage gets obsolete and is replaced by holographic storage, which uses SI: b/cm3 or B/cm3, will the b/in2 go, I am afraid. I did not yet look at other parts of this site, but I think there is hardly any SI on it. Jim and John: I have not found yet the meaning of v.MW. I looked in German dictionaries (Duden) and a technical German dictionary. I have been on the http://www.ptb.de site too, to see if I could find the v.MW among the legal/illegal units; to no avail. When I am home I will go back there and put the question to them. I never had heard about v.MW before too. At present I am on a public computer. Han Japanese page is here. Perpendicular magnetic recording -------------------------------------------------------------------------------- Overview In this project, we are analyzing the possibilities of high density recording by using magnetoresistive (MR) heads designed for conventional longitudinal recording, but with perpendicular media. Currently we are studying the media and the heads required to reach densities over 100 Gbit/inch2. TRL researchers assigned to the IBM Almaden Research Center and leading the detailed analysis in this project. Research items The areal density of hard disk drives is doubling every year. Densities of 17 Gbit/inch2 were achieved in 2000. However, when the density nears 100 Gbit/inch2, it is considered likely that thermal instabilities of the magnetization may appear. The perpendicular recording technology proposed by Professor Iwasaki in 1976 is a promising candidate to overcome this difficulty, since it relies on a different magnetization mechanism. In this project, we study the following problems: Theory of perpendicular recording Suitable media for perpendicular recording Heads for perpendicular recording Signal equalization for perpendicular recording Publications 2000 1999 1998 1997 1996 1995 TRL in the media Nikkei Electronics 07/01/96 Feature articles (Japanese Only) Nikkei Electronics 03/24/97 Technical prompt report (Japanese Only) Last modified 24 January 2001
