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Topic: Some Cards Work Some Don't (Read 285 times) previous topic - next topic

pax_electronica

I tried 4 cards: two 1GB, one 2GB, and one 256MB. The two 1GB cards, Lexar and SanDisk, both failed to initialize. The 2GB card is a micro SD card in a SD adapter. It initializes, was OK with write, but failed read. The 256MB card is Lexar 6MB/sec, and works without any problems.

All tests were done using the CardInfo example that came with Arduino IDE.

Is This Normal?

ieee488

Are the SD cards formatted before hand?

pax_electronica


ieee488

Using SD Association's SD Card Formatter program?

pax_electronica

#4
Jan 13, 2020, 12:37 am Last Edit: Jan 13, 2020, 01:04 am by pax_electronica
No.

I tested another SD card module. For this one, the four signal wires are in a shielded cable that I cut from a broken USB cable. The shield was grounded. It has problem only with the SanDisk 1GB card, saying it cannot find FAT16/FAT32 partition.

The SD Association's SD Card Formatter does not not help. The result is the same.

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