either read the value at Cluster1 (if Cluster2 is READ_CLUSTER) */ or write the Cluster2 value to the FAT entry at Cluster1 */ Read is always via next_cluster wrapper which has extra checks */ It might make sense to manually check old values before a write */ returns: the cluster number (or 1 on error) for read mode */ returns: SUCCESS (or 1 on error) for write mode *
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