blkid: Add support for > 64k cluster NTFS volumes. - #167
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Windows 10 Creators Edition introduced larger cluster sizes for NTFS, but since the number of sectors per cluster is stored as an 8-bit integer and 128 is the largest power of 2 that can be represented as an unsigned 8-bit integer, larger cluster sizes are encoded as a bitshift value / power of two counted down from the value 255. I.e. past the sectors_per_cluster value 128 the actual number of sectors per cluster is calculated as 2^(256 - sectors_per_cluster).
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@tytso Would you please take a look at this patch? It has been sitting here for a good while now and it's needed to support larger NTFS cluster sizes. |
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Windows 10 Creators Edition introduced larger cluster sizes for NTFS, but since the number of sectors per cluster is stored as an 8-bit integer and 128 is the largest power of 2 that can be represented as an unsigned 8-bit integer, larger cluster sizes are encoded as a bitshift value / power of two counted down from the value 255. I.e. past the sectors_per_cluster value 128 the actual number of sectors per cluster is calculated as 2^(256 - sectors_per_cluster).