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From: Jan Panteltje <alien@comet.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Proof of principle demonstration of 3-D magnetic recording
Date: Tue, 09 Apr 2024 12:11:40 GMT
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On a sunny day (Tue, 9 Apr 2024 12:00:40 +0200) it happened Arie de Muijnck
<noreply@ademu.com> wrote in <nnd$6ebcbc3d$25de2d67@8f3b57b8b1b11fb4>:

>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
>> <noreply@ademu.com> wrote in <nnd$16a4abad$09e25412@0ec9ca3c539ad932>:
>> 
>>> 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