SD Card vs. Monster Magnet and Induction Cooker (2000W AC electromagnet)
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- čas přidán 22. 05. 2024
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Are SD cards really magnet proof? Even when thoroughly tested near some of the strongest permanent magnets available? And what about the AC electromagnet in an induction cooker? Will that affect the data on an SD card? Let us find out!
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#SD-card #Magnet #Brainiac75 - Věda a technologie
Can we all just take a second to appreciate the incredible engineering that has led to memory cards the size of a pinky nail-which can hold over a TB of data- that can withstand such insane amounts of magnetic, thermal, and kinetic abuse? I mean...it's honestly mindblowing.
isn't that 32 gb?
it looks like a 32 gb card to me.
@@electricheisenberg5723 That one was, but there are 1TB ones that are just as robust
Yeah, I don't think I could properly understand how older people got by with just kilobytes of data large floppy disk, let alone enormous hard drives that only hold data in the bytes range
@@zx-3948 25 years ago, a 4gb hard drive was normal, if not impressive. That's like, not even a fraction of a video game today! They had an impressive 32 megabytes of RAM!!
End of last century, I programmed big mainframe computers, which would cost millions of £ (or € or $) for an installation. My phone has a 1TB MicroSD card in, more than the total online disk storage of those mainframes.
The processor is probably faster at doing sums, too :-)
That cooker truly 'inducted' this little SD card into the Hall of Fame, in my book.
Ahhh really? Really? Like we aren't suffering enough already from Covid19 and them you had to make this pun and end all hope for humanity. 🤦♂️😆👍
Yes, you have been flagged for a blatant dad joke. Brace for impact...!
czcams.com/video/WwlNPhn64TA/video.html 😲🤣👍
Dude, that comment needs its own hall of fame and you should be flown to Geneva for a black tie award ceremony.
The real consensus of the video, cheap electronic devices aren't worth shit, that capacitor was an abomination.
The other way of looking at this is "Oh that's why this is cheap... Alright, I'll just replace that cap and I still saved myself a few bucks"
Yeah caps and copper wire is usually the only thing they can cheap out on. Replace those and youre fine
Flowxing ...by winding a replacement induction coil? Surely not.
on thee contrary, the cheapo sd cards were actually good
also out of the box != new.. that thing may have been in store for years :)
Since it apparently doesn't damage the data, the monster magnet seems like a great way to avoid losing those tiny things.
PNY is actually a well known brand - also in Denmark.
akyhne and they are a very good products usually too, Iirc they make(or made, I think they still do) gpus that are decent aswell.
yes and all flash memory and 3d nand is all magnetic proof
PNY products have very high quality and are well-known in US, UK and most European countries
I have one of their 2.5 inch 80GB SSD's in my PC and it is really fast (the time to boot linux on the harddrive it replaced was 1 - 2 minutes for the kernel to start all my stuff and the SSD boots in 5 - 15 seconds with the same OS same files and a few extra big files and it has a metal case on it
For photographers PNY is well known and reliable brand
I would be interested to see these same tests done on your regular SD cards, though I fully expect the results to be the same, despite the lack of “magnet proof” advertising.
6:16 reminds me of when I was a kid using a calculator and the calculator would occasionally be wrong with a simple problem such as 3x4=?, I started doing the same problem on the calculator twice every time just to make sure it was right. It's been years since I've seen it happen, but I'll never forget the confusion.
weird
I had similar anomaly. I was coping a SQL schema. I tried to run it but it seems to have an syntax error and it was, one letter was changed into ",".
# calc --no-error-when-divided-by-zero --debug 52 div 0
0 x 0 = 0, 0≠52, skip;
1 x 0 = 0, 0≠52, skip;
2 x 0 = 0, 0≠52, skip;
E: found divizion by zero, continue;
3 x 0 = 0, 0≠52, skip;
...
calc not responding, continue? (y/n)
Me and my friends had the same type of calculator in school but one time we had same formula written in the calculator and we had 3 different results
It used to happen sometimes when the battery was low
To say PNY, just say each separate letter, something like "pee en why".
god you are a genius
@Dr. Coomer thank you for finding me a good movie
I'm saying it pony from now on, lol.
Why am I peeing?
I knew we’d meet each other again.
We are coterminous.
It would be interesting to see the effects of ionising radiation on microSD cards. Something like a big gamma ray source (maybe over a longer test time) or an Xray machine...
Just leave the memory card in direct sun for a set amount of time.
The sun does release ionizing radiation.
Plenty of it
@@zdw306 Actually, it doesn't. Not any that reaches Earth, anyways. UVA/B/C is actually not ionising radiation because it doesn't have the energy to ionise atoms (but it has enough energy to mess up with DNA). Ionising radiation begins in the EUV (extreme UV) part of the spectrum, and that's strongly attenuated by Earth's atmosphere, as well X-rays and gamma rays (not that the Sun emits many at its surface).
Or a microwave oven
@@spicemasterii6775 Microwaves aren't ionising.
At worst it'll just melt the card.
@@GRBtutorials In fact part of the UVC spectrum is ionizing by the technical definitions of both, and also in fact although you are correct that it is strongly attenuated in the atmosphere it does reach the surface.
6:04 So you practically demagnetized the card's casing in the alternating magnetic field.
Because the card clearly reacts to strong magnetic field, I guess it has some ferromagnetic protective casing. In very strong (unipolar) field you can induce small remanence field into it, and that could be reason for the altered reading. If that is the case, it is evident why AC field of induction cooker could not have any effect.
(But form the get-go, induction heater is not a good source for *strong* magnetic fields, because you don't need *strong* magnetic field to have large eddy currents in a conductive plate. Fast changing magnetic field is enough it induce the eddy currents.)
re: self-repairing checksum. It could have been some parity Error Correction routine on the SD card. Blocks are being constantly written/erased/re-written on the SD card. Perhaps some of the "magnetic protection" the card has relates to its error correction ability... 🤔
SD cards are flash memory. The blocks aren't constantly being rewritten since flash blocks only can be rewritten a couple thousand times before they break. Any process which constantly rewrites those blocks would very quickly kill the SD card.
I think it's more likely that a bus error happened. The SD signal passes trough a connector with possibly some dust on it which can make the signal quite noisy. It's possible that this electronic noise caused a bit to flip while reading the card. Error correction would have occured before reading the card, and it is deterministic so if it fails once it would keep failing on subsequent attempts too if the data was actually corrupt.
@@IkBenBenG Bus error was the first thing it came to my mind too and the other stuff you mention, however i am unsure of this because i think windows run checkdisk when you insert partitions so if the file system repaired a single or a few flipped weak bits it might have been the reason why that weird thing happened.
My knowledge level ends here though, and since this is way more complicated that what i know some one else could be able to explain/confirm this.
Another possibility is that some cell or paths became slightly magnetised and so disturbed electrical the read out of a cell (bit/byte ?). The second time the card went through the magnet the cell or path got demagnetised thus things got back to normal.
Any error checking, block fuckery, checksum garbage would be handled by windows drivers; not anything loaded on the card itself. I don't know anything about electromagnetic noise but i know a good amount about windows filesystem bits and bobs; also the fact that there is no firmware on any card - no code to be executed, and no electrical component with significant logic. It is all handled software wise by the driver.
@@IkBenBenG yep its better to not to delete anything on those SD cards
Interesting results! In the CZcams poll I guessed that it wouldn't be affected by either because the SD card doesn't have any components that would be affected by a static field (surprised to see that it does!) and the induced current by the induction cooker wouldn't be enough to fry something in it, but I wasn't entirely sure. Great video as always!
when typing the parameters for commandlets, you can save yourself keystrokes by pressing tab after partially typing it :)
And in addition you can just press arrow up to go through previously used commands.
If your typing speed is good then no one would bother to save, just type feels ok
@@waseemabbas6703 It's definitely good if you only (want to) remember the first part of the file. That way you do save yourself a bit of time even if you type fast.
and just use bash
@@waseemabbas6703 yeah no, you're still going to save yourself allot of time, that argument can be use against the "press arrow up" because sometimes you have to edit some part of the previous command and pressing arrow up and moving the cursor or deleting parts of it can be slower then just pressing the first few characters and tab.
Though I was slightly triggered by him not using arrow up in this instance, and also not just doing ctrl+a ctrl+v every time, thus making 2^x copies.
6:29
"Terrestrial SEU arise due to cosmic particles colliding with atoms in the atmosphere, creating cascades or showers of neutrons and protons, which in turn may interact with electronic circuits. At deep sub-micron geometries, this affects semiconductor devices in the atmosphere."
lol wow, that's actually really cool.
Indeed 🤣🤣👌👌
I always get excited when I see your videos come up on my feed. Can’t wait to watch it.
Good job man, Been here since 10k subs. Keep them coming!
0:46
PNY is a known brand, I know they make budget graphics cards and all sorts of other PC electronics
They are actually THE Partner of nVidia: They are the sole manufacturer of nVidia Quadro GPU's and produce the Founder's Edition GPU's.
Mars magnus are you sure? Or do they just produce the parts? Thanks, either way
@@BHK0000 As far as I know they are the sole manufacturer of professional nVidia Products: nVidia designs the Silicon, TSMC is producing the Chips and PNY is assembling the PCB's and nVidia stamps it's name on it.
Here is the website of PNY Europe for professional applications. If you go to on of the Products you can see that they directly offer product support.
www.pny.eu/en/professional/explore-pny
They also make plenty of good flash storage devices
Wow, that's cool! I always wonder about stuff like this in claims on products. Good to see this stood up to the challenges vs magnetism that it claimed. I figured for sure those sandwiched 6x2s would have gave it a run for its money. Even if unintentional, it's a good testimonial for PNY.
Thank you for the effort made for this video . You are awesome!
Good job on testing it, changing and testing, putting it back and testing again. Proper science!
I have watched you for six years, you are one of the few CZcamsrs I know that focuses only on quality and not quantity, you’re the best 💛⚠️🇩🇰
Thank you very much, InfinityPlusOne. This platform tends to reward quantity, but luckily I have a good day job (and generous patrons) to take care of the finances, so I can keep focusing on quality over quantity. Thanks for the continuous support!
I believe that even the card that doesnt say that its magnet-proof wouldnt be affected. Advertising an sd card as magnetproof is like saying a glass of water is waterproof. What i mean is that a cards behaviour to magnetic fields is constantly the same and that being able to resist magnetic fields is completely normal.
Thank you! Not only entertaining, I learned something! I love it when that happens.
Awesome, something great to watch before bed. Thanks for the upload 😃
Takes me back to when I was a kid in the 80's, testing floppy disk data integrity after putting them near various magnets.
Sounds like an expensive hobby. My dad always made me keep floppy disks very far from any sort of magnets.
I did the same thing in the 90s, and was very disappointed when even disassembling a 1.44MB floppy and having a tape degausser sit directly against the disk surface didn't flip a single bit.
hmm makes me wonder what the card would do in an MRI Scanner. Like a Siemens Symphony (1,5T) or Skyra (3T)
probably not much except jumping into the scanner and getting lost. the card is probably a bigger threat to the scanner then the scanner is to it.
@@TheObsesedAnimeFreaks agreed
I have a s10 with a normal SD card and went into the magnetom Skyra 3T and Altea 1.5 T by accident (forgot it while storing things in the pocket) and everything is totally fine
Its an Sandisc not specialized for magnetic fields...
Inspirational, educational - this is what we call the science show! Best ad tie-in, ever. Two opposable ambulatory sensorial appendages up!
finally a good video in the midst of quarantine
We just knew you were cooking something up, it was in the cards.
Turns out his financial records were also on the card, he was trying to cook the books
Aaron Greenfield Thats pretty good XD
Your voice is so calming
Loved the experiments !
Truly appreciate the OP test 🙏
actually you should test it with an improvised emp device. although induction cooker is a beast, i'd like to see how they react to a big massive pulse.
Hah, of course this video had to be 13:37 long! :-)
I couldn't resist it - though I had to rush the ending a bit :) Thanks for watching!
He knows all this and never heard of the brand PNY 🤨
Now that I think about it... other of his videos are also 13:37 long... that's 1337!
The Mad Atheist yes I’m seeing this too
13:38 on mobile lel
Fantastic vid, I wondered! Big thumbs up!
Wait that san disk says x-ray proof. What's up with that?
means that you can have your card in your laptop or luggage and pass it through airport x-ray scanners without losing your data.
Oh shit, Here we go again
@@taldmd is that just marketing though? Or is data actually at risk if something that isnt marked as x ray proof ran through some xrays?
@@deathnightANIMATED It damages unexposed film, so this would be marketing aimed at people who used to fly with film cameras and are scared of their digital pictures being erased.
@@OnlyMisery Oh yeah, here we go again.
One of these days you should make a video where you try and separate the magnets.
I have thought about it. But the magnets are still useful for me together :) Thanks for watching!
Didn't he already? I seem to recall some thing with a board with a hole in it, you drop the magnets in, put another board on top with a hole and then slide them sideways using a come-a-long or something? Or am I crazy?
@@bullhornzz He has done it with smaller magnets in the past.
@@brainiac75 But HOW.... I have big problems just pulling the magnets in harddrives apart. How the helvede do you do that? :P
How would other storage devices do in these conditions? Of course, a magnetic hard drive would be destroyed, but what about SSDs? Since they have a lot of traces on the PCB
Good test; this gives peace of mind. As for the one test with the different checksum, USB and/or flash-media are not as reliable as people think, just because Windows doesn't throw an error when reading/writing a flash-drive or memory-card doesn't mean it was perfect, sometimes read or writes fail silently; that's why it's important to always verify files to/from flash-media.
The possibility that you caught a soft bitflip during the checksum calculation on video is incredible
In my experience, video and audio players are notorious for changing files (e.g. when the error correction kicks in, the corrected file is stored; or the player keeps some metadata with the last stop position) even when you do not press "Save". You can avoid this by *not* opening the file in the media player after you did the checksum, or (easier) by flipping the write protect switch of the SD card (which will protect against overwriting by the computer, but of cours not against magnets).
Not first.
Also, great video! I don't know what else to say other than I expected nothing to happen to begin with, due to the data not being stored magnetically.
I love the brainiac logo not only is it "good" looking it also is the warning thing i don't mean the quotations in a rude way
I was itching to comment "Just push the up arrow in PowerShell !" and then you pressed the up arrow in the final hash test and I could breathe again... Nice work.
Cosmic rays have probably messed up that poor bit in RAM, I bet. Unfortunately, that's hard to avoid.
Time to upgrade the Earth's magnetic field.
@@pattheplanter Isaac Arthur is on it.
@Lenny69 シ that doesn't work on laptops only expensive servers
I m suprised that you don't know PNY
I mean it's not like you should... They're crap. Every single PNY USB drive I have had has been utterly slow and I've had two PNY micro SD read lock themselves due to failure.
Sandisk is very dominant on the Danish SD card magnet. PNY is not :) Thanks for watching!
@@brainiac75 PNY has been on the Danish market for many years.
edbpriser.dk lists 55 GPU cards alone,from the company.
@@parkerlreed PNY probably doesn't make SD cards. Just like most companies, they buy cards with specific requirements and put their name on it.
And most brands that sells SD cards have cheap and expensive models. The more expensive are usually of a better quality.
People tends to buy the cheaper ones.
@@parkerlreed Your an idiot who doesn't know what he's talking about. PNY makes all sorts of stuff and are as legit a company as they come. They make GPU's that cost more than anything your poor ass owns. If you bought a slow USB drive, that's your fault for not looking at the specs before buying. Not all USB drives/SD cards/etc... are equal, that's why price points can vary so much even within the same brand... -_-
Cheap NAND flash products from ANY brand will be slow & potentially unreliable. That's why they are cheap. PNY/SanDisk/etc... all buy their NAND chips from literally the exact same manufacturers.
I really love your logo, very well done sir
I have used PNY cards for years in several devices (DSLR camera, phone, tablet, security camera, etc) and never had any issues. Thanks for mostly confirming the magnet proof claim
Last time I was this early, people still knew what 1337 meant
I'm late..., what does 1337 mean? My first guess is that it's 1:37 in the afternoon.
Search for 'leet' which the numbers can be read as. Thanks for watching!
Bonus info: This video is 13:37 and 13 frames. leetle x) Thanks for watching!
SD Card goes into a spa
Receptionist: Hi what can I do for you today?
SD Card: Can I get A *magnetic massage*
Nice vid btw very interesting
Amazing video as always! We may not be quarantined here in Sweden, but the general mood is uneasy and very stressful, so a video from one of my favourite youtubers definitely helped cheer me up ♡
Thank you for this work.
I'd like to see a normal SD card passing through these tests.
Apparently, I was right! What do I win? Just kidding.
Hehe, all the polls are totally anonymous - even I can't see who voted what, so it's hard to announce winners :D But you just got a heart from me....
@@brainiac75 I got a heart for my original comment about it doing nothing, so I now have two. My ppprrreeeccciiiooouuusss.
7:04 - 'Error code 0.... Bummer!' I laughed way too much at this but then again, I have been in lockdown for nearly 2 weeks.
Your one of my favorite mad scientists-evil villains. Great video!
My theory is that there was a misreading because there was some static voltage on the connection "pins" of the micro sd.
Idk this brand, is it...pony?
Lol that's my favorite part
Thank you, that is great to know
Regarding powershell; holding shift whilst right-clicking in a folder, allows opening a powershell in that folder... Dragging a file in for it's path is a neat new one I learned today :)
8:50 android interface
What Happens when you "Cook" your Monster Magnets on the induction plate? Will it blow Up or does the Magnet get hot? 🤔🧐
Above a certain temperature, the magnet loses cohesion and stops being a magnet. So then you have turned your hundreds of dollars worth of a magnet into a heavy lump of metal. You could still use it as a paperwight though.
Thanks for the suggestion to a video, where I will test several objects on the induction cooker. Could be interesting to see :)
@@Seegalgalguntijak That's my guess too.
But don't you think there could possibly be an interference because of the size and strength of this monstrosity of an Magnet which destroys the MOSFET/TRIACs? Normally the heated Material schould be magnetic but no Magnet.
Even IF the induction destroys the Magnet - would'nt it be possible to re - magnetify it using the coil with DC voltage instead?
@Hypno993 I will not test the induction cooker with my largest magnets. I believe induced heat could be a problem and cause permanent damage. So I will use a smaller, less expensive magnet :)
@@brainiac75 Neodymium is flammable so I assume you will be very careful in case it shatters and ignites?
Even though I'm an mechatronic engineer and I'm familiar with the effects of magnetic fields and the magnetic flux that the card was exposed to, I'm not an expert in computer science. I do believe though that the inner memory bits could have been corrupted in the card but once you insert it on the PC and windows recognizes it, it goes through a process of restoring the files to their original values. Internet and data transfer protocols use check bytes on their packages to correct any errors and it could be that windows also has some data check and correction bytes along with the files to restore them if corrupted. Check with an expert on PCs if there could be a storage format or file type that doesn't have that corruption restoring option and then do the same experiments. It would be interesting to know the results then 👍🏻
Interesting video. Thank you.
If I had to guess, Windows changed some metadata in the file and that got modified and that changed your checksum. Next time do this kind of thing on a Linux system.
Metadata should not change the checksum of a file though, as usually the checksums are only calculated over the actual file content. I don't know how this specific windows hash command works though.
I believe the metadata are not accounted for in the checksum - but yes, Windows may be the underlying problem... I have an old Thinkpad with an Ubuntu installation on it from a previous video ;) Thanks for watching!
@@brainiac75 Honestly I think the most likely scenario is a read error from the SD card. CPUs are usually very stable and don't miscalculate things, unless you overclock / undervolt it above it's limits.
This experiment did not meet the level of scientific rigor usually found on your channel. Especially that hickup with the hash code. Entertaining video none the less.
at 2:29 you change 1 character and my internet died...very impressed :)
Big fun here! Some notes: the energy you'll need to flip a mosfet on the MLC arrays is really millions of orders of magnitudes smaller than cosmic rays. Those are only able to be matched on earth by particles accelerators, so you might have an idea of the kEv that represents
Interesting - thanks for this.
Interesting result. I expected the induction cooker to have more of an effect, but I guess the small amount of metal in the card doesn't get enough Eddy currents to heat it up considerably. Maybe because I thought it was going to be one of those induction heaters that quickly bring metal red hot.
My first thought was an induction furnace. That would have been impressive.
just wanna throw this out, PNY has been a computer part manufacturer for ages, they used to offer a lifetime warranty on absolutely everything they sold and I have never had one of their components fail, This video makes me happy to see they still have great products.
thanks to you im starting to love magnets
I sure learned something Brainiac75!
Totally brilliant testing! The hash anomaly may have been caused by a power spike during file transfer and not necessarily any external atomic influence. It's probable that an external power source such as a boiler kicking in for central heating or something along those lines, fired up during the hash test. Only way to probably prove this is to use a power socket that isn't surge protected while the laptop is plugged in on PSU?
Wish you talked a bit about that single-event upset, that is some really cool phenomenon.
I have an idea for the video, what if you took the giant double neodymium magnet and then see what it does to some household items, and maybe some not household items.
Love your channel, I have been always fascinated by magnets and for christmas I'm getting a 1.35x1.35x2.35 inch neodymium magnet.
10:24 video files are compressed, so change of a single bit can cause huge effects. to prevent this video files have error correction bits, and little bit errors can be compensated without a single artifact. also storage media has error correction bits to correct little bit errors without giving an error message.
About that large video file: What was the video encoder? Was it a compressed video? Did you try with a video format which has high compression ratio?
Well done on all the work involved. I would of been surprised that there would of been any change by a magnet. Do not know why you had a wrong check sum. Does this make SD cards EMP proof?
Very interesting. I wonder how much the latest LTO tape can take, or any LTO for that matter. I know analog video tape can be harder to erase then one might think. Of course the audio/time code tracks (linear) will go first, then the control track. But the video seems to take much more to erase it. It's possible without super strong magnets like you have but you really have to beat the signal out of it for a while. I haven't tried neodymium yet but I have access to many formats so I should try it.
I burst out laughing when he called it pony 🤣🤣😂 it's P.N.Y like F.B.I or C.S.I :)
Awesome testing and card!
What filesystem type was the card formatted to?
I would assume NTFS
PNY is fairly well know. They may also be using software tricks to help keep the integrity of the file such as SMART, with detects degrated blocks of data and guesses what they were and stores them somewhere else. That could change the hash signature but keep the integrity making it somewhat resilient to permanent magnets.
Could you please provide the original testfile? I would really like to test where in the file the bitflip happened.(Altough you probably didn't save the corrupted file it should still be possible to find the bitflip if we know the hash - and bruteforce it programatically)
Please try the FC command to identify the wrong bits by comparing byte-by-byte to the original video file on the computer. preferably with the /B option.
As others have pointed out, maybe the flash controller circuit inside the card did something to recover from the issue, although sector duplication is unlikely for a large copied-in file, ECC kicking in and/or successfully recovering from noise in the sector allocation data are more likely.
With modern MLC flash technology, a card written to only 1/3 of its apparent capacity may have stored its data in a more robust SLC format, with the controller converting previously filled sectors to MLC format as the card fills up (this is also one of the few ways a singly-written video file copy might have a second copy of its sectors).
fascinating stuff !
Thank you
I have a SSD from this PNY brand and it holds up pretty good. Indeed, another SSD from Kingston I bought to my dad 1 year later thand my PNY give the ghost and mine still works.
Very interesting!
Wow hmm, very interesting. Thank you
Yeah, I tried using an Induction cooker in my last video to melt Metal and had the same Problem with the magnetic sensor.
The Coil also detects if the Metal gets to hot,maybe thats because it looses its magnetic properties at those temperatures...
Yes, I believe metal does lose its magnetic properties at a a certain temperature. I only recently learnt this in a video about how rice cookers work - basically they have a magnetic switch and the metal ceases to be magnetic at just above the boiling point of water, so once all the water is absorbed the bowl heats up more, then the metal switch drops the magnet turning off the cooker.
The Curie Point of iron is 1043K, which is quite a lot hotter than you would want it to get. I kind of doubt the coil can detect if it's too hot (given that 'too hot' might be 400C).
SD cards don’t write in magnetic code. They write in NAND Flash. Used in Flash drives, SSD’s, and, you guessed it, SD cards.
They work by having 2 crystals set apart bij a non-conductive layer. (Capacitor) each of these crystals have have up to 4 electrons in them in any configuration so that makes 4x2 bits that can be stored in each capacitor. That’s a Byte.
Magnets don’t do anything to this, except a really powerful one that might damage the electronics.
I believe SanDisk doesn't write magnet proof on their cards, because the memory typically used is not affected by magnets, and there is not really a reason to think that magnets would do anything to the memory except for the common association with hard drives. But from a technical point of view, they're supposed to be pretty magnet proof.
Although one could indeed think of side effects like inducing so much current into the internal wiring that you physically break it or something similar.
where do you buy the magnets?
I wonder if there was some sort of error correction taking place with the first test? Might have been a random error too. Might be interesting to take that card and leave it with your magnets for a few weeks then test it again.
Excellent!
I'm wondering if the AC nature of the induction cooker magnetic field throws off the tesla meter. Assuming that the measurement takes a bit of time could mean that the reversal cancels out much of the reading in progress.
It could've been a SEU, or one of the Row/Column select transistors' gate was charged by current, causing an entire row/column to be read incorrectly until it was actually accessed and pulled low again.
Very impressive, especially given that's I've had a 32GB PNY card that had huge compatibility problems with devices.
The intro have some super powers..😎