Difference between revisions of "ExFAT Implementation Notes"
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Again, exFAT shares the same problems discussed in [[FAT_Implementation_Notes#Metadata_Addressing]], and the same solution is used. Note that normal exFAT files have at least three directory entry structures (more the longer the filename is), so the metadata addresses will increase by three or more for files in the same directory. | Again, exFAT shares the same problems discussed in [[FAT_Implementation_Notes#Metadata_Addressing]], and the same solution is used. Note that normal exFAT files have at least three directory entry structures (more the longer the filename is), so the metadata addresses will increase by three or more for files in the same directory. | ||
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| + | = fsstat and FAT Chains = | ||
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| + | Like FAT, exFAT does have FAT chains. However, they are only used to keep track of clusters for fragmented files. Printing a list of FAT Chains in fsstat could give the incorrect impression that those were the only allocated sectors, so it was decided that this part of the output should be hidden for exFAT. | ||
Revision as of 05:52, 31 December 2013
Note: Need to add links to this, and probably some exFAT stuff in general to the wiki when this page is done.
Introduction
Disk Unit Addressing
Like FAT, exFAT saves file content in clusters, which are groupings of consecutive sectors (512-bytes each). It has the same problems as FAT in using these clusters as the addressable units, so like FAT the solution is to use sectors as the addressable unit instead. See FAT_Implementation_Notes#Disk_Unit_Addressing for more information.
Metadata Addressing
Again, exFAT shares the same problems discussed in FAT_Implementation_Notes#Metadata_Addressing, and the same solution is used. Note that normal exFAT files have at least three directory entry structures (more the longer the filename is), so the metadata addresses will increase by three or more for files in the same directory.
fsstat and FAT Chains
Like FAT, exFAT does have FAT chains. However, they are only used to keep track of clusters for fragmented files. Printing a list of FAT Chains in fsstat could give the incorrect impression that those were the only allocated sectors, so it was decided that this part of the output should be hidden for exFAT.
