Homebrew Issue with 3DS SD Card

[Baccabechoppin]

I haven't used my 3DS for sometime, but went to update Luma and everything today in order to ensure I had everything up to date before I performed a system update. However I seem to be unable to copy anything to my SD card anymore. I never had this issue prior but now anything I try to copy to the SD yields the error 'cannot read from original file' or something along those lines.
I have tested with a second SD card on the same computer and had no issues copying the same file to that SD card. So what's wrong with this one?

 

[Nemos59]

Test your SD card with h2testw (https://3ds.hacks.guide/h2testw-(windows).html)
to see if it's not fake/corrupted