diff --git a/sys/src/9/pc/sdata.c b/sys/src/9/pc/sdata.c
index 498e829a9..5266646ab 100644
--- a/sys/src/9/pc/sdata.c
+++ b/sys/src/9/pc/sdata.c
@@ -2003,6 +2003,7 @@ atapnp(void)
 		case (0x4376<<16)|0x1002:	/* ATI SB400 PATA */
 		case (0x4379<<16)|0x1002:	/* ATI SB400 SATA */
 		case (0x437a<<16)|0x1002:	/* ATI SB400 SATA */
+		case (0x438c<<16)|0x1002:	/* ATI SB600 PATA */
 			break;
 		case (0x0211<<16)|0x1166:	/* ServerWorks IB6566 */
 			{