==== SD Card Info ====
SD Type: SDHC FAT16, Size: 2.93GB
SD Blocks: total: 374, size: 512B
SD Clusters: total: 47996, blocks: 128, size: 64.00KB
SD File: SYSTEM~1, type: dir, size: 64.00KB
SD File: DIFF.TXT, type: file, size: 46B
SD File: TSTAMP.TXT, type: file, size: 12B
I can read and write files OK (DIFF.TXT and TSTAMP.TXT are created by my project) but SD.exists() and SD.remove() give WDT resets.