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henry payne, sandra oh, covert bailey, guesthouse, fat's bistro, putnam publishing group, python, websitehosting, oppenhiemer, high blood pressure, travel, comedies & family ent., constantine tsapralis, fps's, web page design, about web page design, computer program, jason clarke, lowercase, | All other values in the FAT point to particular data clusters, and as no two files or directories should ever use the same cluster, all non-"special" values in the FAT should occur once and only once in each FAT. Directory structure A directory contains directory entries, and alex breckenridge all but the root directories of FAT12 and FAT16 volumes are merely files that contain directory alex breckenridge entries and have the "directory" attribute bit set in their own directory entry. All directories other than the root start off with . and .. entries that point alex breckenridge to themselves and their parent directories respectively. For this reason, even an "empty" subdirectory uses one data cluster, to hold the . and .. pointers. It's important to remember that . and .. are actual entries, rather than conceptual entities; a corrupted . |
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For the purposes of this page, it is the pointer entries we are are most interested in - and the address of the first data cluster in particular. File structure A file has at least one and usually three components: A directory entry that defines the file A set of values in the FAT python that define the data clusters, if any python None or more data clusters that contain the actual data itself If a file has zero length, then there are no data clusters python or FAT entries associated with it. FAT structure Each copy of the FAT starts with some marker bits, and then consists of cluster addresses. To look up the "next cluster", you read the FAT at an offset based on the cluster you are currently on; the address held at that offset is that of the next cluster. There are some "special" values; a zero means the cluster is not in use, and two particular high values are used to signify the last cluster of a chain and a "bad" cluster that should not be used, respectively. |
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