Combining MemoryCard and SdFat libraries into SD library.

Defaulting to CS pin 4 (for Arduino Ethernet Shield).  Holding the SS pin high (for disabling W5100 on the Ethernet Shield).

libraries/SD/examples/FeatureDemo/FeatureDemo.pde

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+/*
+
+  A sketch to demonstrate the features of the SD library.
+
+*/
+
+#include <SD.h>
+
+void setup() {
+
+  Serial.begin(9600);
+  
+  
+  // You always need to initialise the SD library
+  Serial.println("Init SD...");
+  SD.begin();
+
+
+  // This demonstrates making a directory hierarchy
+  Serial.println();
+  Serial.println("Make directory...");
+  SD.makeDir("/apple/banana/cabbage/");
+
+
+  // You can check for the existence of specific files/directories
+  char *filePathOne = "/apple/banana/cabbage/";
+  char *filePathTwo = "/apple/banana/cabbage/dog/";
+
+  Serial.println();
+  
+  Serial.print(filePathOne);
+  Serial.print(" does ");
+  if (SD.exists(filePathOne)) {
+    Serial.println("exist.");
+  } else {
+    Serial.println("not exist.");
+  }
+  
+  Serial.print(filePathTwo);
+  Serial.print(" does ");
+  if (SD.exists(filePathTwo)) {
+    Serial.println("exist.");
+  } else {
+    Serial.println("not exist.");
+  }
+  
+
+  // Demonstrate writing (and appending to existing file content)
+  // to a file in a subdirectory
+  Serial.println();
+  Serial.println("Writing to 'dolphin.txt'.");
+  
+  SD.open("/apple/banana/cabbage/dolphin.txt", true);
+  
+  SD.file.println("This line was appended to the file.");
+  
+  SD.close();
+  
+
+  // Demonstrate writing to a file in the root directory and overwriting any
+  // existing content
+  Serial.println();  
+  Serial.println("Writing to 'top.txt'.");
+  
+  SD.open("/top.txt", true, false);
+  
+  SD.file.println("This line overwrote the previous content of the file.");
+  
+  SD.close();
+
+
+  // Demonstrate reading from a file in a subdirectory
+  Serial.println();  
+  Serial.println("Reading 'dolphin.txt':");
+  
+  SD.open("/apple/banana/cabbage/dolphin.txt");
+  
+  int c;
+  
+  // This approach may be easier to follow
+  while(true) {
+    c = SD.file.read();
+    if (c < 0) {
+      break;
+    }
+    Serial.print((char) c);
+  }
+  
+  SD.close();
+  
+
+  // Demonstrate reading from a file in the root directory in a slightly different way
+  Serial.println();  
+  Serial.println("Reading 'top.txt':");
+  
+  SD.open("/top.txt");
+  
+  // This approach is more compact
+  while((c = SD.file.read()) >= 0) {
+    Serial.print((char) c);
+  }
+  
+  SD.close();
+  
+  
+  // Demonstration complete!
+  Serial.println();  
+  Serial.println("Done.");
+}
+
+void loop() {
+}
+
+