Re: Proof of principle demonstration of 3-D magnetic recording

On a sunny day (Tue, 9 Apr 2024 23:19:29 +0100) it happened John R Walliker
<jrwalliker@gmail.com> wrote in <uv4eri$2es1$1@dont-email.me>:

On 09/04/2024 09:46, Jan Panteltje wrote:

On a sunny day (Tue, 9 Apr 2024 10:07:12 +0200) it happened Jeroen Belleman
<jeroen@nospam.please> wrote in <uv2svn$3p4r$1@dont-email.me>:
 

On 4/9/24 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
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Picture of layers:
    https://www.nims.go.jp/eng/news/press/2024/03/202403270.html
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Great idea for recording.
Now we just have to invent a reading system...
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Arie
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correlation of 2 magnetic sensors pointing down in an angle?
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MS1 MS  MS2
   \  \/  /
=========== top layer
     \  /
      \/
=========== second layer
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Use fixed font.
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Have not tried it...

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They seem to have three distinguishable levels of magnetization,
so about 1.5 bits per cell.
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Jeroen Belleman

 
I once did read about 3D storage with lasrs in some crystal or something..
No idea if that ever came to market.
And storage in DNA...

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Here are a couple of early review papers on holographic recording:
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https://downloads.bbc.co.uk/rd/pubs/reports/1973-39.pdf
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http://downloads.bbc.co.uk/rd/pubs/reports/1973-40.pdf
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John

Interesting links
Yes I am familiar with holograms, may still have some somewhere.
That started after visiting some exhibition in London where they demonstrated some...
Bought some holograms there and had a helium neon laser from an old Philips player at home...