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Hopefully this will help.
The key thing here is cluster size since that is the smallest chunk of space the file system can allocate for a given file. So with a 16k cluster size, 2 8k files would require 32k of space. FAT16 can only keep track of a fixed number of clusters, so larger device capacity usually means that larger cluster size s required. FAT32 can keep track of a larger number of clusters, so cluster size can be much smaller on higher capacity devices. FAT32 is also more reliable.
If you store a few large files on the device, cluster size is not as significant. However, storing many small files on a device formatted with a large cluster size can waste significant amounts of space. Sector size cannot be modified.
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What God has brought together, let man not part. Matt 19:6
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