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Anchor10464051046405 Devices and Volumes Anchor10465061046506To begin reading files from a medium or creating files on a medium, that medium (hereafter called a device) and the driver which will be used to access it must be registered with the file system. After that, a volume must be opened on that device (analogous to “mounting”). This operation will succeed if and only if the device responds and the file system control structures (for FAT, the Boot Parameter Block or BPB) are located and validated. Anchor10465071046507

In this manual, as in the design of µC/FS, the terms ‘device’ and ‘volume’ have distinct, non-overlapping meanings. We define a ‘device’ as a single physical or logical entity which contains a continuous sequence of addressable sectors. An SD/MMC card is a physical device. Anchor10465091046509

We define a ‘volume’ as a collection of files and directories on a device. anchor10465111046511

These definitions were selected so that multiple volumes could be opened on a device (as shown in Figure 5 Figure 7-1) without requiring ambiguous terminology. Anchor10500271050027 Image Removed

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Figure 7-1 Device and volume architecture