In the ResUsageSVPR table, why is CylinderIndex IO greater than DataBlock IO?

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In the ResUsageSVPR table, why is CylinderIndex IO greater than DataBlock IO?

For a given time period, I find that FileSCiAcqKB and FileSciDyRRelKB are both much larger than the sum of FileSDbAcqKB and FileSDBPresKB. Why would there be more IO reported to CylinderIndices than DataBlocks?

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