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dynamic index buffers

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I think I''m having trouble clearing my dynamic index buffers. Will this take care of it?
  
pIndexBuffer->Lock(0, 0, (BYTE**)&pIndices, D3DLOCK_DISCARD);
pIndexBuffer->Unlock();	
  
or do I need something like this?
  
pIndexBuffer->Lock(0, 0, (BYTE**)&pIndices, D3DLOCK_DISCARD);
memset(pIndices,0,numIndices*sizeof(WORD));
pIndexBuffer->Unlock();	
  
thanks.

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D3DLOCK_DISCARD will not touch the data itself, so you could have *anything* in there. memset is fine.

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