Index: /trunk/src/VBox/Devices/Storage/DevAHCI.cpp
===================================================================
--- /trunk/src/VBox/Devices/Storage/DevAHCI.cpp	(revision 37886)
+++ /trunk/src/VBox/Devices/Storage/DevAHCI.cpp	(revision 37887)
@@ -4142,5 +4142,5 @@
     {
         case 2048:
-            pAhciPortTaskState->uOffset = iATAPILBA * cbSector;
+            pAhciPortTaskState->uOffset = (uint64_t)iATAPILBA * cbSector;
             pAhciPortTaskState->cbTransfer = cSectors * cbSector;
             break;
@@ -4148,5 +4148,5 @@
         {
             pAhciPortTaskState->pfnPostProcess = atapiReadSectors2352PostProcess;
-            pAhciPortTaskState->uOffset = iATAPILBA * 2048;
+            pAhciPortTaskState->uOffset = (uint64_t)iATAPILBA * 2048;
             pAhciPortTaskState->cbTransfer = cSectors * 2048;
             break;