then lock it normally. By using swapable memory, geodes can potentially use much more memory than the roughly 450K available in the global heap. However, accessing an unlocked swapable block can potentially be much slower than accessing a non-swapable block, as the block may have to be copied in from the disk.</LI>
<LI>
Discardable<BR>
<A NAME="IX_Discardable memory">
 </A>
A discardable block has HF_FIXED set to zero and HF_DISCARDABLE set to one. Sometimes it doesn't make sense to copy a block to the disk