diff --git a/src/Kernel/BlkDev/DiskAHCI.ZC b/src/Kernel/BlkDev/DiskAHCI.ZC
index 3b3aa133..160a8290 100755
--- a/src/Kernel/BlkDev/DiskAHCI.ZC
+++ b/src/Kernel/BlkDev/DiskAHCI.ZC
@@ -574,6 +574,17 @@ U0 AHCIPortIdentify(CBlkDev *bd)
 	CPortCmdHeader	*cmd_header	= AHCIPortActiveHeaderGet(bd->port_num, cmd_slot);
 	U16				*dev_id_record;
 
+	if (sys_boot_src.u16[0] == BOOT_SRC_DVD)
+	{
+		"AHCI: DEBUG: AHCIPortIdentify variable check 0\n";
+		"port->command:           0x%016X\n", port->command;
+		"cmd_header->desc:        0x%016X\n", cmd_header->desc;
+		"port->cmd_issue:         0x%016X\n", port->cmd_issue;
+		"port->device_sleep:      0x%016X\n", port->device_sleep;
+		"port->fis_switch_ctrl:   0x%016X\n", port->fis_switch_ctrl;
+	}
+
+	port->device_sleep = 0; // clear device sleep bits for debug sake
 	if (sys_boot_src.u16[0] == BOOT_SRC_DVD)
 	{
 		"AHCI: DEBUG: AHCIPortIdentify variable check 1\n";