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Devices and Volumes
5-1 DEVICE OPERATIONS
The ultimate purpose of a file system device is to hold data. Consequently, two major
operations that can occur on a device are the reading and writing of individual sectors. Five
additional operations can be performed which affect not just individual sectors, but the
whole device:
■
A device can be opened . During the opening of a device, it is initialized and its
characteristics are determined (sector size, number of sectors, vendor).
■
A device can be partitioned . Partitioning ivides the final unallocated portion of the
device into two parts, so that a volume could be located on each (see section 5-4
“Partitions” on page 72).
■
A device can be low-level formatted . Some device must be low-level formatted before
being used.
■
A device can be (high-level) formatted . (High-level) formatting writes the control
information for a file system to a device so that a volume on it can be mounted.
Essentially, (high-level) formatting is the process of creating a volume on an empty
device or partition.
■
A device can be closed . During the closing of a device, it is uninitialized (if necessary)
and associated structures are freed.
These operations and the corresponding API functions are discussed in this section. For
information about using device names, see section 4-2 “μC/FS Device and Volume Names”
on page 61.
Function
FSDev_Close()
FSDev_GetNbrPartitions()
FSDev_IO_Ctrl()
FSDev_Open()
FSDev_PartitionAdd()
Description
Remove device from file system.
Get number of paritions on a device.
Perform device I/O control operation.
Add device to file system.
Add partition to device.
68
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