CanadaPlus
@CanadaPlus@lemmy.sdf.org
- Comment on A rant on left-wing online infighting 4 days ago:
The sad thing is, I’m sure you believe that.
- Comment on A rant on left-wing online infighting 4 days ago:
Ah yes, if you kick everyone else out you can guarantee there’s only one toxic person in the room.
- Comment on A rant on left-wing online infighting 5 days ago:
I think the important thing, for those of us in the picture anyway, is to be more aware of why we do what we do. We’re not robots programmed to save the world; there’s always something else driving it.
- Comment on A rant on left-wing online infighting 5 days ago:
It’s not just online. Monty Python made a joke about this in Life of Brian back in the 70’s.
I’m not asking people to change their mind on what they think of a person because of an isolated good thing they do, but to at least acknowledge it as a good thing or add nuance describing what about it you like or don’t. I can accept saying “I don’t think this is a good thing in this circumstance”, “this person will not follow through with this thing I think is good thing because ___”, or “they are doing a good thing for wrong and selfish reasons” too. But to outright deny any support for an action because of a wildly extrapolated character judgement of the person doing it, when that user would support it otherwise, vexes me greatly.
Ah, but nuance isn’t very motivating to the vast majority of people. Ego and having an identity is, though, and some people also crave conflict. Thinking this way serves all three.
- Comment on [deleted] 1 week ago:
Cool troll bro.
- Comment on This Early SSD Was WILD 2 weeks ago:
This is the exact kind of weird hardware nonsense I love.
- Comment on This Early SSD Was WILD 2 weeks ago:
You hear people saying everything is more expensive now, and for low-tech things that’s true, but electronics have sure gone the other way hard.
- Comment on For crying in the sink, stop posting imgur links 3 weeks ago:
Yeah, I’m not sure what that’s about then. Maybe run a VPN over your VPN? Haha.
- Comment on For crying in the sink, stop posting imgur links 3 weeks ago:
I can use it over Tor. Or at least, can use it without noticeably more circuit changes than usual.
Are you sure your work doesn’t just block it?
- Comment on For crying in the sink, stop posting imgur links 3 weeks ago:
It’d be kind of weird if anyone on SDF doesn’t know how to run a VPN, anyway.
- Comment on thank you 3 weeks ago:
Dope!
- Comment on Researchers Discover the Optimal Way To Optimize 3 weeks ago:
To give some detail they didn’t, they designed an algorithm that’s as good as possible using the specific approach they used. I was all excited someone had finally designed a provably polynomial pivot rule. This is a more modest step forwards, and depends among other things on a small amount of random noise being added to the problem.
- Comment on KIDPIX 4 weeks ago:
I remember it from good times in the early grades, and from the time I misclicked it in later grades during some pretty serious assignment and it fucking screamed through the lab, haha.
- Comment on KIDPIX 4 weeks ago:
Yes, it definitely still wasn’t on the school computers a decade later. /s
- Comment on Is there some sort of "underground" net for old computing? 1 month ago:
Sounds dumb. /s
- Comment on Image uploads aren't working again 1 month ago:
Did they come back at some point since your last post?
- Comment on What is there to know about magnetic storage mediums? 1 month ago:
Hmm, all the way up at 1mm. Man, that tape length really adds up, doesn’t it? So, to the question exaclty as I asked it, I guess obviously yes.
If I’m also building the head, the dielectric gap that does the reading and writing can probably be as small as tens of microns, since you can fairly easily make an edge that fine. Keeping the tape clean and even enough to not crash would be hard in that context, though, since it seems like clearance needs to be on a similar magnitude. Does anybody know what consumer tape reader/recorders use?
In tape form getting an even layer of medium might also be challenging, although if I went with a disk instead it could be spin-coated. Highly oriented particles sound doable with a bit of chemistry.
I’d upvote this, but ironically it would make it look like I didn’t upvote it.
- Comment on What is there to know about magnetic storage mediums? 1 month ago:
Wow, exactly the kind of thing I was looking for posted in 3 minutes. Amazing!
It goes into pretty poor detail on the actual medium itself, unfortunately. How fine were the particles? What was the exact recipe that worked?
Some of the commenters had much more interesting things to say:
@verdatum
> As a kid, the thing that blew me away was Tim Hunkin’s The Secret Life of Machines. He had an episode on the cassette player/recorder where his partner demonstrated that cassette tape could be emulated by taking Scotch tape patting it into a or iron-oxide and running that result over the tape heads. “This is the sound of my voice recorded on sticky-tape and rust.” that revelation absolutely blew my child mind. :::: ::: spoiler @DerWahreTee >I might be able to give you some advise here. I am a material chemist and I professionally work on polymer coatings similar to the one your using. I think your problem is at least partially a poor particle distribution and uneven coating thickness. The particulate you are trying to suspend needs to have a particle size <1mikrometer. When you buy such particles as a dry poor they have agglomerated during the drying process I.e. they have become stuck together in unevenly sized chunks. This creates also makes the particles less evenly spread throughout your coating than it visually appears. To break up these agglomerates you actually need a tremendous amount of kinetic energy which your magnetic stirrer can not do. Also the Mayer-bar isn’t really the ideal method to apply your coating even if you can’t see it it is notoriously uneven on a microscopic level especially when applied by hand. Ideally you would use a spincoater which could apply you coating more evenly. Hope this helps
@fiscap
Commercially produced floppy disks go through a magnetic alignment process, while the coating is still wet. I think the magnetic particles in your solution/suspension are too random to produce a consistent and reliable flux transition during the write process. If you do try this again, try to figure out a process to align the particle orientation and keep it in place until the coating fully cures.
@stamasd8500
> I am pretty sure the magnetic material that you used is part of the problem. You don’t give a lot of detail on what exactly you used, but in the video you say “black iron oxide” so I infer you used magnetite, Fe3O4. That is not the correct material to use. I did some research not long ago into magnetic materials used in the period, and even recreated some magnetic material after poring through some research papers and patents from the 1950s to 70s. The magnetic material used on floppy disks is a type II or III material (as defined for magnetic tapes) so either a cobalt-doped gamma-Fe2O3 or a chromium dioxide-based material. Magnetite is not correct as it doesn’t have the required saturation flux and coercivity. I have in fact recreated in my basement lab a type II material, a cobalt-doped gamma-Fe2O3 ferrite which would be appropriate for that. It’s not difficult but it requires patience and precision. And a few tools, including an electric oven that can go to at least 850 degrees Celsius.
The last one gives me one possible place to search next. What are the numbered material types referenced?
Anyway, if it weren’t for the sponsor, the way to make the substrate would have been just a punch, right?
- Submitted 1 month ago to retrocomputing@lemmy.sdf.org | 4 comments
- Comment on 1 month ago:
So that’s 20 Hz? Lol. That is like a baloney slicer.
I suppose, even though they had the technology to make a much faster platter, they way they were using disk storage at the time probably made seek time not an issue. The alternative would have been spooling through a tape for a while.
- Comment on 1 month ago:
They did without the grotesque luxury of lower case letters.
- Comment on 1 month ago:
I mean, I’m sure cost saving on labour were noticed as well. And that’s not a bad thing. I, for one, am pro-flying shuttle loom.
- Comment on 1 month ago:
How else are they supposed to program with handheld bar magnets? /s
- Comment on What would have to happen to make everybody realize we weren't exaggerating when we said Trump would be like Hitler? 1 month ago:
You go further, people don’t necessarily know how oblivious America is either, and go more by romanticised Hollywood tropes about the land of opportunity and cowboys.
Source: Have family all over.
Also, we pretty much see America as an enemy more often than not these days. You can shove that 51st state implication.
- Comment on What would have to happen to make everybody realize we weren't exaggerating when we said Trump would be like Hitler? 1 month ago:
As someone from outside, lol no.
Most Americans don’t understand that other countries have sovereignty as good as their own. Or that they are as good as any other people.
Okay, that bit is true. Hitler was a bit more than just oblivious, though.
- Comment on What would have to happen to make everybody realize we weren't exaggerating when we said Trump would be like Hitler? 1 month ago:
They don’t want Hitler, they just want everything he stood for with a few groups swapped out. If they actually wanted Hitler that would be bad, because dad/grandpa fought against Hitler.
Any apparent hypocrisy is just a technicality, and people only point it out because of their derangement syndrome. /s
- Comment on What would have to happen to make everybody realize we weren't exaggerating when we said Trump would be like Hitler? 1 month ago:
He would have to grow a tiny mustache and start speaking German.
Okay, maybe it’s not that bad, but it really does seem like people have trouble generalising the concept of a fascist outside of it’s historical visual trappings.
- Comment on Whats a good Resource on Learning 6502 Assembly, for someone who has little to no experience Programming? 2 months ago:
Wow, what a place to start!
- Comment on Stop trying to make ‘kagis’ a thing. 3 months ago:
We really need a single word, given how often it comes up.
- Comment on Low-quality papers based on public health data are flooding the scientific literature 3 months ago:
The motivation isn’t, but the technology to generate a slop paper is.