diff --git a/sbin/camcontrol/camcontrol.8 b/sbin/camcontrol/camcontrol.8
--- a/sbin/camcontrol/camcontrol.8
+++ b/sbin/camcontrol/camcontrol.8
@@ -115,6 +115,7 @@
 .Op Fl P
 .Op Fl G
 .Op Fl q
+.Op Fl r Ar value
 .Op Fl s
 .Op Fl S Ar offset
 .Op Fl X
@@ -645,7 +646,8 @@
 .Tn SCSI
 READ DEFECT DATA (12) command (0xB7) to the given device, and
 print out any combination of: the total number of defects, the primary
-defect list (PLIST), and the grown defect list (GLIST).
+defect list (PLIST), the grown defect list (GLIST) and any vendor specific
+defect list(s) that setting the reserve bits generate.
 .Bl -tag -width 11n
 .It Fl f Ar format
 Specify the requested format of the defect list.
@@ -698,6 +700,12 @@
 When printing status information with
 .Fl s ,
 only print the number of defects.
+.It Fl r Ar value
+Sets the reserved bits of byte 2 of the READ DEFECT DATA command to
+.Ar value
+This causes vendor specific behavior, such as returning other types of
+defects.
+The value is ORed into byte 2 and may only specify bits in the mask 0xe0.
 .It Fl s
 Just print the number of defects, not the list of defects.
 .It Fl S Ar offset
diff --git a/sbin/camcontrol/camcontrol.c b/sbin/camcontrol/camcontrol.c
--- a/sbin/camcontrol/camcontrol.c
+++ b/sbin/camcontrol/camcontrol.c
@@ -175,7 +175,7 @@
 };
 
 static const char scsicmd_opts[] = "a:c:dfi:o:r";
-static const char readdefect_opts[] = "f:GPqsS:X";
+static const char readdefect_opts[] = "f:GPqr:sS:X";
 static const char negotiate_opts[] = "acD:M:O:qR:T:UW:";
 static const char smprg_opts[] = "l";
 static const char smppc_opts[] = "a:A:d:lm:M:o:p:s:S:T:";
@@ -3878,6 +3878,22 @@
 		case 'q':
 			quiet = true;
 			break;
+		case 'r': {
+			char *endptr;
+			unsigned long reserved;
+			const unsigned long byte2_defined = SRDD10_PLIST |
+			    SRDD10_GLIST | SRDD10_DLIST_FORMAT_MASK;
+
+			reserved = strtoul(optarg, &endptr, 0);
+			if (*endptr != '\0' ||
+			    (reserved & byte2_defined) ||
+			    reserved > 0xff) {
+				error = 1;
+				warnx("invalid reserved bits %s", optarg);
+			}
+			list_format |= reserved;
+			break;
+		}
 		case 's':
 			summary = true;
 			break;