Index: /trunk/src/VBox/Devices/PC/BIOS-new/ahci.c
===================================================================
--- /trunk/src/VBox/Devices/PC/BIOS-new/ahci.c	(revision 39597)
+++ /trunk/src/VBox/Devices/PC/BIOS-new/ahci.c	(revision 39598)
@@ -322,6 +322,6 @@
 
     /* Set up the PRDT. */
-    ahci->aPrdt[prdt_idx].len       = ahci->edds.u.sg[prdt_idx].size - 1;
-    ahci->aPrdt[prdt_idx].phys_addr = ahci->edds.u.sg[prdt_idx].phys_addr;
+    ahci->aPrdt[prdt_idx].len       = ahci->edds.u.sg[0].size - 1;
+    ahci->aPrdt[prdt_idx].phys_addr = ahci->edds.u.sg[0].phys_addr;
     ++prdt_idx;