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Windows CE implements a separate file system — the FAT file system — to support block devices. The FAT file system does not read or write to block devices directly; it uses underlying block device drivers for all access to block device hardware. The block device driver must present the block device to the FAT file system as a block-oriented device.
Block device drivers transparently manage or emulate ordinary disk drives, so applications do not need to behave differently when reading and writing files to the block device. The FAT file system provides an abstraction between files in the application name space, such as \PC Card\Excel Docs\Expense report.pxl, and devices in the device name space, such as DSK1:. The block device driver is responsible for enhancing the safety of I/O operations even when interrupted by a power cycle. The FAT file system accesses the block device by calling the block device driver's IOControlfunction with the appropriate I/O control codes. OEMs can implement additional installable file systems.
Last updated on Tuesday, July 13, 2004