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From: John R Walliker <jrwalliker@gmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Proof of principle demonstration of 3-D magnetic recording
Date: Tue, 9 Apr 2024 23:19:29 +0100
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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
>>>>>
>>>>> 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...
>>
>> They seem to have three distinguishable levels of magnetization,
>> so about 1.5 bits per cell.
>>
>> 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...

Here are a couple of early review papers on holographic recording:

https://downloads.bbc.co.uk/rd/pubs/reports/1973-39.pdf

http://downloads.bbc.co.uk/rd/pubs/reports/1973-40.pdf

John