Index: /trunk/src/VBox/Devices/Storage/DevAHCI.cpp
===================================================================
--- /trunk/src/VBox/Devices/Storage/DevAHCI.cpp	(revision 55724)
+++ /trunk/src/VBox/Devices/Storage/DevAHCI.cpp	(revision 55725)
@@ -6475,5 +6475,5 @@
             break;
         default: /* For debugging purposes. */
-            AssertMsgFailed(("Unknown command issued\n"));
+            AssertMsgFailed(("Unknown command issued (%#x)\n", pCmdFis[AHCI_CMDFIS_CMD]));
             pAhciReq->uATARegError = ABRT_ERR;
             pAhciReq->uATARegStatus = ATA_STAT_READY | ATA_STAT_ERR;