--- src/sys/dev/disk/nata/atapi-cam.c	2007/06/03 04:48:29	1.6
+++ src/sys/dev/disk/nata/atapi-cam.c	2007/07/23 19:24:11	1.7
@@ -588,7 +588,8 @@ atapi_action(struct cam_sim *sim, union
 	request->driver = hcb;
 	request->data = buf;
 	request->bytecount = len;
-	request->transfersize = min(request->bytecount, 65534);
+	request->transfersize = min(request->bytecount,
+				min(softc->ata_ch->dma->max_iosize, 65534));
 	request->timeout = ccb_h->timeout / 1000; /* XXX lost granularity */
 	request->retries = 2;
 	request->callback = &atapi_cb;