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Devices and Volumes
directory open ( fs_opendir() or FSDir_Open() ) is initiated on a device that was not
present at the last attempted access, μC/FS attempts to refresh the device information; if that
succeeds, it attempts to refresh the volume information.
Files and directories have additional behavior. If a file is opened on a volume, and the
underlying device is subsequently removed or changed, all further accesses using the file
API (e.g., FSFile_Rd() ) will fail with the error code FS_ERR_DEV_CHNGD ; all POSIX API
functions will return error values The file should then be closed (to free the file structure).
Similarly, if a directory is opened on a volume, and the underlying device is subsequently
removed or changed, all further FSDir_Rd() attempts will fail with the error code
FS_ERR_DEV_CHNGD ; fs_readdir_r() will return 1. The directory should then be closed (to
free the directory structure).
5-4 PARTITIONS
A device can be partitioned into two or more regions, and a file system created on one or
more of these, each of which could be mounted as a volume. μC/FS can handle and make
DOS-style partitions, which is a common partitioning system.
The first sector on a device with DOS-style partitions is the Master Boot Record (MBR), with
a partition table with four entries, each describing a partition. An MBR entry contains the
start address of a partition, the number of sectors it contains and its type. The structure of a
MBR entry and the MBR sector is shown in Figure 5-4.
4
8
12
16
Flag
Start CHS Addr
Type
End CHS Addr
Start LBA Addr
Size in Sectors
Figure 5-3 Partition entry format.
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