SD Memory Cards No Access

I have been trying to get an SD card slot to work on an Arduino UNO. I have gotten SW to recognize the card reader but the Sw can not identify the Partition so it i will not initialize.

I have seen many articles regarding this phenomime but I have not seen any solutions. I Am curious what the root cause is. I have tried many combinations of FAT types and parameter settings to no availe.

Doe any one know what Aspect make some SD cards work and others not? What parameters must be set?


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