look on /dev/sdD0 too.  I've got a cpu server
with no magnetic disks and the cfdisk won't fit
in the first ide controller's slot (due to overcrowding
inside the machine), so it ends up being /dev/sdD0.

Reference: /n/sources/patch/applied/readnvram-sdd0
Date: Mon Jan 17 16:47:23 CET 2005

--- /sys/src/libauthsrv/readnvram.c	Mon Jan 17 16:47:23 2005
+++ /sys/src/libauthsrv/readnvram.c	Mon Jan 17 16:47:23 2005
@@ -29,6 +29,8 @@
 	"pc", "#S/sdC0/9fat", -1, sizeof(Nvrsafe),
 	"pc", "#S/sdC1/nvram", 0, sizeof(Nvrsafe),
 	"pc", "#S/sdC1/9fat", -1, sizeof(Nvrsafe),
+	"pc", "#S/sdD0/nvram", 0, sizeof(Nvrsafe),
+	"pc", "#S/sdD0/9fat", -1, sizeof(Nvrsafe),
 	"pc", "#S/sd00/nvram", 0, sizeof(Nvrsafe),
 	"pc", "#S/sd00/9fat", -1, sizeof(Nvrsafe),
 	"pc", "#S/sd01/nvram", 0, sizeof(Nvrsafe),