SD Card Storage

The file system is central to the Unix system design, from which Linux borrows. The necessary mass storage requirements have traditionally been fulfilled through hard disk subsystems. However, as Linux hosts become as small as cell phones, flash memory technology has replaced the bulky mechanical drive.

SD Card Media

The standard SD card is 32 mm long, 24 mm wide, and 2.1 mm thick. Figure 8-1 illustrates the connections available on the underside of the SD card. The schematic excerpt shown later will document how the connections are made to this media.

Figure 8-1. SD card pinout

SD Card Interface

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