Index: head/sys/dev/usb/quirk/usb_quirk.h
===================================================================
--- head/sys/dev/usb/quirk/usb_quirk.h
+++ head/sys/dev/usb/quirk/usb_quirk.h
@@ -93,6 +93,7 @@
 	UQ_MSC_FORCE_PROTO_ATAPI,	/* force ATAPI command protocol */
 	UQ_MSC_FORCE_PROTO_UFI,		/* force UFI command protocol */
 	UQ_MSC_FORCE_PROTO_RBC,		/* force RBC command protocol */
+	UQ_MSC_IGNORE,			/* device should be ignored by umass */
 
 	/* Ejection of mass storage (driver disk) */
 	UQ_MSC_EJECT_HUAWEI,		/* ejects after Huawei USB command */
Index: head/sys/dev/usb/quirk/usb_quirk.c
===================================================================
--- head/sys/dev/usb/quirk/usb_quirk.c
+++ head/sys/dev/usb/quirk/usb_quirk.c
@@ -539,6 +539,7 @@
 	USB_QUIRK(QUALCOMMINC, ZTE_MF730M, 0x0000, 0xffff, UQ_MSC_NO_GETMAXLUN,
 	    UQ_MSC_NO_INQUIRY, UQ_CFG_INDEX_0),
 	USB_QUIRK(SMART2, G2MEMKEY, 0x0000, 0xffff, UQ_MSC_NO_INQUIRY),
+	USB_QUIRK(RALINK, RT_STOR, 0x0001, 0x0001, UQ_MSC_IGNORE),
 	/* Non-standard USB MIDI devices */
 	USB_QUIRK(ROLAND, UM1, 0x0000, 0xffff, UQ_AU_VENDOR_CLASS),
 	USB_QUIRK(ROLAND, SC8850, 0x0000, 0xffff, UQ_AU_VENDOR_CLASS),
@@ -642,6 +643,7 @@
 	[UQ_MSC_FORCE_PROTO_ATAPI]	= "UQ_MSC_FORCE_PROTO_ATAPI",
 	[UQ_MSC_FORCE_PROTO_UFI]	= "UQ_MSC_FORCE_PROTO_UFI",
 	[UQ_MSC_FORCE_PROTO_RBC]	= "UQ_MSC_FORCE_PROTO_RBC",
+	[UQ_MSC_IGNORE]			= "UQ_MSC_IGNORE",
 	[UQ_MSC_EJECT_HUAWEI]		= "UQ_MSC_EJECT_HUAWEI",
 	[UQ_MSC_EJECT_SIERRA]		= "UQ_MSC_EJECT_SIERRA",
 	[UQ_MSC_EJECT_SCSIEJECT]	= "UQ_MSC_EJECT_SCSIEJECT",
Index: head/sys/dev/usb/storage/umass.c
===================================================================
--- head/sys/dev/usb/storage/umass.c
+++ head/sys/dev/usb/storage/umass.c
@@ -784,6 +784,12 @@
 	memset(&ret, 0, sizeof(ret));
 	ret.error = BUS_PROBE_GENERIC;
 
+	/* Check if we should deny probing. */
+	if (usb_test_quirk(uaa, UQ_MSC_IGNORE)) {
+		ret.error = ENXIO;
+		goto done;
+	}
+
 	/* Search for protocol enforcement */
 
 	if (usb_test_quirk(uaa, UQ_MSC_FORCE_WIRE_BBB)) {