7z/zip Files Corrupting When Downloaded Directly To Sd Card

So I've been having a very puzzling issue for the past few days now. I can't seem to find anything about this online.

A few days ago I started downloading some files to my new SanDisk 128gb Micro SD card, inserted into my computer via the the SD slot. My computer is running Windows 10 and is a Lenovo brand PC. After downloading, I noticed some of the files were apparently corrupt or had "data errors" according to both WinRAR and 7zip when trying to extract them; they were all in some compressed format, mostly 7z and some standard zips.

Thinking it might be the site, I try downloading elsewhere across 2 different sites. But downloads from there also corrupt, and I've never had issues with these sites before. Starting to think it's my internet, I try the next day after restarting my router, but still I'm getting corrupt downloads. I'm downloading directly through Chrome, no download managers.

I try formatting the SD and running a full H2testw scan on it, no issues, still corrupting downloads though. I try another identical SD card, and that's ALSO corrupting downloads. Thinking it might be my SD slot at this point, I switch to using my USB SD card adaptor, but nope, downloads corrupt when downloading through that as well.

I have tried downloading these same files directly to my HDD, and they're always fine; no errors when testing or extracting them. They also seem to remain fine when copying over to the SD card from there. Files that are not compressed that I download directly to the SD card also seem fine. If I copy over any 7z/zip file that is apparently corrupt over to my HDD, it will remain corrupt there as well. These files are all appearing fine in windows explorer as well (and seemingly have the correct file size), they only have issues when trying to extract or test the files via 7zip or WinRAR.

I decide to try out my old Windows 8 laptop. I download about 15 or so different files from there directly to my SD card using the same USB adaptor, and they're all fine and extract fine. Now I'm even more confused, why do these files corrupt when downloading them from my desktop Windows 10 but not my laptop? I'm also just downloading from Chrome on there (same version). The only other difference I can think of is that I'm downloading over wifi on there, and on ethernet on my desktop.

The files I'm downloading are fairly large (200mb - 1.5gb), but I don't know if that really makes much of a difference. One other thing I noticed when downloading on my desktop was that the read/write light on the USB adaptor would sometimes stop flashing briefly during downloads, despite the downloads still increasing in size. I didn't notice it stop once on my laptop, and it's a very obnoxious bright red light that literally shines right through the white plastic casing, so I think I would have noticed it stopped flashing out of the corner of my eye.

I know I could just download directly to my HDD and copy the files over to my SD card, which I plan to do from now on, but it's still a minor inconvenience, and I'm still completely baffled as to what this issue might be. I'm slightly worried there might be something worried with my computer. I've never even encountered corrupted downloaded files before this whole situation. I should note I've also checked the SMART status of the HDD and it's apparently fine, and done a few virus scans with Malwarebytes, and it doesn't detect anything. Does anyone have any advice on what might be causing this?

 

Hate to bump this, can't seem to edit the original post. I just want to add that after some more testing, I think the issue is that my computer doesn't seem to like the exFAT format. I tried testing out two of my external HDDs, one formatted as NTFS and one as exFAT, by downloading 7 different 7z files individually to both. The NTFS HDD had no issues with any of the files, but one of the files corrupted for the exFAT one. Both 7 files were identical, just downloaded individually to both. All my SD cards are also in exFAT format.

Again, this issue is only affecting my desktop Windows 10 however, not my Windows 8 laptop. What could be the issue here? Why are compressed files downloaded directly to exFAT formats sometimes corrupting themselves?

 

could it be a malware

 

I don't think so, I've done several scans with malwarebytes and it hasn't detected anything. I have also tried downloading some compressed files to an exFAT SD card on a different Windows 10 (laptop), and they sometimes corrupt on there as well. At this point, I'm starting to think Windows 10 is the issue, maybe it just hates exFAT format.

 

Try formatting the card with this software.

SD Memory Card Formatter.
https://www.sdcard.org/downloads/formatter/index.html

 

I've already tried formatting/re-formatting both SD cards, but the issue persists. This issue is also happening with an external HDD that is formatted as exFAT. As per my previous post, this is happening on 2 different Windows 10 computers, but doesn't seem to be happening with my Windows 8 laptop. Got a feeling it's some weird Windows 10 specific thing, perhaps.

 

I agree.
But we need to rule out a few things to be sure.

Format the memory card with the software I linked to.

 

Already have, for both SD cards.