I didn't want to sell them with defective cards, so I decided to rip one of the good ones & clone it to some new cheap-but-ok cards
In this process I found that only 2 of the 10 cards were good 🙃
Here's the good rip I got after MANY tries https://archive.org/details/M8-8001100-V8.0-20240828-64G
@misty it was!! especially with each rip being 64GB (ish) .... those are a lot harder to manage than the like 4MB Game Boy roms I usually deal with
I had to write custom scripts to compare them and identify bad sectors cos nothing I'd normally use was really practical for dealing with files of that size