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 Post subject: Re: neodimium sculpture
PostPosted: Fri Dec 24, 2021 8:37 pm 
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Ah, Fujitsu! The company that can’t help but be different.

Their hard drives were always a little, off, in looks. Back when removable platters were common they made sealed canisters.

Everyone is law made 8” drives. …they made 5.75”.

You see this one. ‘let’s put it in the outside’ lol.

When they partnered with AMD they had some chips the were diamonds when everyone else made squares.
And a few round ones.

For better and for worse they are another company in the model of Apple and CBM. And they’re much older.
They were being different before Apple even thought about “think different”!

That’s a lovely drive, btw.


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 Post subject: Re: neodimium sculpture
PostPosted: Fri Dec 24, 2021 9:01 pm 

Joined: Sat Nov 29, 2014 9:44 pm
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lostinlodos wrote:
That’s a lovely drive, btw.

Thanks!

I took a bunch of teardown pictures I wanted to share at some point. The fujitsu is one of them. See the curved magnets?!? I thought that was a nice surprise.

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 Post subject: Re: neodimium sculpture
PostPosted: Fri Dec 24, 2021 9:33 pm 
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Fujitsu Was always a fun company to watch in Storage.

They were one of the pioneers of magnetic optical discs. Both laser guided magnetic writing and much more recently magnetic guided dual laser holographic storage.

You ever want to see something really crazy look out for one of the impossible to find 5.75” disks. They have a triple magnet float, and the arm shoulder is dead centre on the narrow side opposite the connector side.
They used a pre-raid method of striping across the two platters. Reading and ordering the data from both platters in the buffer.

They’re also a big producer of board art. Everything from alien invasions and Kaiju to crazy manga style story shorts.
Secret messages, like “can I help you” and “go away, turn back”.

If you can read Japanese they’re quite fun.
Back long ago Byte ran an ed on the messages in EEPROMS like “don’t kill me” and “I want to live” and the Japanese programming joke, “must not the sun set?”
太陽が沈まなければ昇らない。
(If the sun should not set it will not rise).
Parodying the need to erase the chip to reprogram it.


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 Post subject: Re: neodimium sculpture
PostPosted: Fri Dec 24, 2021 11:43 pm 

Joined: Thu Dec 09, 2021 6:29 pm
Posts: 39
AAK2 wrote:
How do you get the magnets off of the Permalloy backing?

You tube showed putting it in acetone, which didn't peel the plating. I guess it dissolved the glue. It also said this won't work all the time


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 Post subject: Re: neodimium sculpture
PostPosted: Sat Dec 25, 2021 12:16 am 

Joined: Sat Nov 29, 2014 9:44 pm
Posts: 899
Location: I'm right here :D
I imagine the force of the magnet essentially creates a seal to prevent the acetone from penetrating far into the adhesive.

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 Post subject: Re: neodimium sculpture
PostPosted: Mon Jan 03, 2022 11:59 pm 

Joined: Tue Mar 26, 2019 3:21 pm
Posts: 60
A couple years ago I put several magnets into a jar of acetone and left them there over a month. It did not dissolve the adhesive. Perhaps on some it will, but not the ones I tried. When I tried bending the backing place, either the magnet broke or it pulled the nickel plating off. I will try the heat method as Lost suggests.


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 Post subject: Re: neodimium sculpture
PostPosted: Tue Jan 04, 2022 1:15 am 
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I’ve always had bad luck bending.
With an easy dump local I don’t even try unless it’s way beyond average magnetic strength. And a bonus rate for the permalloy!

Bending opposite directions (two players one forwards on back) works better than simple bending.


Here’s my best guess from experience breakdown. I could be inaccurate or totally wrong. All of this is minimal, at the least guessing.


7? Different Glues.
3 petroleum. Monitor heat when using acid.

2 organic. One of them immune to just about every consumer acid out there.

2 metallic glues. Both dissolve easily. One is aluminium silicatricarb. The other is a weird alloy I’ve only found in ultra-high-speed drives that exceed 20K rpm. Whatever it both i an my overly helpful sci-testing yard have been unable to recover anything from it.

That’s just what I’ve seen. There’s also bonding and binding agents out there. I’ve come across that stuff in prototype and enterprise drives. Nothing you can do here. That’s fusing chemically. Kool irreversible stuff.


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