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docs/library/uos.rst: Clarify why the extended interface exists.
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@@ -234,6 +234,10 @@ methods (see below), in order to support a variety of use cases. A given block
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device may implement one form or the other, or both at the same time. The second
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form (with the offset parameter) is referred to as the "extended interface".
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Some filesystems (such as littlefs) that require more control over write
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operations, for example writing to sub-block regions without erasing, may require
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that the block device supports the extended interface.
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.. class:: AbstractBlockDev(...)
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Construct a block device object. The parameters to the constructor are
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