Index: /trunk/src/VBox/Devices/Storage/DevAHCI.cpp
===================================================================
--- /trunk/src/VBox/Devices/Storage/DevAHCI.cpp	(revision 39583)
+++ /trunk/src/VBox/Devices/Storage/DevAHCI.cpp	(revision 39584)
@@ -5165,5 +5165,10 @@
 
             for (cActualSGEntry = 0; cActualSGEntry < cSGLEntriesGCRead; cActualSGEntry++)
-            cbSGBuffers += (aSGLEntry[cActualSGEntry].u32DescInf & SGLENTRY_DESCINF_DBC) + 1;
+            {
+                cbSGBuffers += (aSGLEntry[cActualSGEntry].u32DescInf & SGLENTRY_DESCINF_DBC) + 1;
+                ahciLog(("%s: SG Entry: info %08X at phys %08X'%08X (%u bytes)\n", __FUNCTION__, aSGLEntry[cActualSGEntry].u32DescInf,
+                         aSGLEntry[cActualSGEntry].u32DBAUp, aSGLEntry[cActualSGEntry].u32DBA,
+                         (aSGLEntry[cActualSGEntry].u32DescInf & SGLENTRY_DESCINF_DBC) + 1));
+            }
 
             /* Set address to the next entries to read. */