Path: ...!weretis.net!feeder8.news.weretis.net!reader5.news.weretis.net!news.solani.org!.POSTED!not-for-mail From: Jan Panteltje Newsgroups: sci.electronics.design Subject: Re: Proof of principle demonstration of 3-D magnetic recording Date: Tue, 09 Apr 2024 12:11:40 GMT Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; ISO-8859-15 Content-Transfer-Encoding: 8bit Injection-Date: Tue, 9 Apr 2024 12:11:40 -0000 (UTC) Injection-Info: solani.org; logging-data="392718"; mail-complaints-to="abuse@news.solani.org" User-Agent: NewsFleX-1.5.7.5 (Linux-5.15.32-v7l+) Cancel-Lock: sha1:aU0X5PJ2Ew8BnZG9cAuFMuRjba0= X-Newsreader-location: NewsFleX-1.5.7.5 (c) 'LIGHTSPEED' off line news reader for the Linux platform NewsFleX homepage: http://www.panteltje.nl/panteltje/newsflex/ and ftp download ftp://sunsite.unc.edu/pub/linux/system/news/readers/ X-User-ID: eJwFwYEBACAEBMCVUJ7GEf3+I3TnC4qODcd2Opsq5W9EjCzQgma16qbuw6yGPCsNiDJwmtWT7TJJu+P3A24VFnA= Bytes: 3627 Lines: 56 On a sunny day (Tue, 9 Apr 2024 12:00:40 +0200) it happened Arie de Muijnck wrote in : >On 2024-04-09 09:49, Jan Panteltje wrote: >> On a sunny day (Tue, 9 Apr 2024 09:19:46 +0200) it happened Arie de Muijnck >> wrote in : >> >>> On 2024-04-09 06:42, Jan Panteltje wrote: >>>> Proof-of-principle demonstration of 3-D magnetic recording >>>> Possibility of ultra-high density hard disk drives with areal densities exceeding 10 Tbit/in² using multi-level magnetic >>>> recording >>>> https://www.sciencedaily.com/releases/2024/04/240408130543.htm >>>> >>>> Picture of layers: >>>> https://www.nims.go.jp/eng/news/press/2024/03/202403270.html >>>> >>> >>> Great idea for recording. >>> Now we just have to invent a reading system... >>> >>> Arie >>> >> >> correlation of 2 magnetic sensors pointing down in an angle? >> >> MS1 MS MS2 >> \ \/ / >> =========== top layer >> \ / >> \/ >> =========== second layer >> >> Use fixed font. >> >> Have not tried it... > >Pointing magnetic sensors? Thin beams? Unknown to me. >Array of (non-thin beam!) sensors + tomography? Might work. > >Glad I'm retired, this looks too much like the DocData optical tape storage I worked on. Had to look that up, in Dutch: https://nl.wikipedia.org/wiki/DOCdata strange, never heard of that At some point Philips asked me to write the service documentation for their Videodisc. I have written English service documentation from lab reports for Philips Mil in Huizen, and worked in their service-center, so they knew me. As I had a lot of experience with Ampex magnetic video tape I suggested a dropout compensation system to them back then. Went in to some detail in Eindhoven.. but that analog optical video disc never really came of the ground. https://en.wikipedia.org/wiki/Videodisc The whole world changed when MPEG compression became available, https://en.wikipedia.org/wiki/MPEG-1 now you could store movies digitally in much less space, like on an audio CD. and digital error detection and correction became possible. I still have the old Laser Vision 92VP830 and 22VP932 repair method and service manual and schematics upstairs in a drawer. https://www.siwe.be/files/collectie/V366-Philips-Laserdisc-VLP830-200pi.pdf