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Message: [QUOTE="Gordon Beaton, post: 587828"] Since ByteBuffer (which allocateDirect() refers to) is abstract, I guess the existence of a backing array depends on the particular subclass implementation. The ByteBuffer created by NewDirectByteBuffer() is backed by the array that you provide. If you provide one, it will have one. I think this much is clear. But note too that ByteBuffer.hasArray() returns false if the backing array is read-only. That could be the case if you create a MappedByteBuffer from a read-only file, or if the pointer you pass to NewDirectByteBuffer() refers to read-only memory. [...] Except for the read-only comment above, I'm not really sure. /gordon [/QUOTE]