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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: Wed, 10 Apr 2024 05:57:32 GMT
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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
>>>>>>
>>>>>> 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

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...