This chapter discusses the following functions of the SD library:
The hardware needed to run the examples in this chapter includes:
- Arduino Uno
- Ethernet shield (Arduino, SainSmart, or similar board)
- Micro-SD Card
The hunger for storage has increased exponentially. Early computers did not have hard drives; the operating system and applications were stored on a floppy disk. The first commercially available floppy disk was an 8-inch disk, which became available in 1971. It could store an enormous 175 KB of data. In 1976, the standard became 5 ¼ inch (ironically known as the minifloppy). The original model could store 87.5 KB, but newer models could store more than 1 megabyte. The large slots on your desktop computer that house a DVD drive or Blu-ray drive are that size because of floppy disks; the size of the minifloppy disk drive became standard.
As technology advanced, so did the storage capacity of disks, and 5 ¼-inch disks were considered too big; the computer industry turned to 3 ½-inch floppies, known as micro-floppies. Early models could store 360 KB, but later models could either be single density (720 KB) or ...