1 files changed, 11 insertions, 0 deletions
diff --git a/extras/ata_id/ata_id.c b/extras/ata_id/ata_id.c
index 66b9f42332..cbd3b5b8d2 100644
--- a/extras/ata_id/ata_id.c
+++ b/extras/ata_id/ata_id.c
@@ -38,6 +38,7 @@
 #include <linux/types.h>
 #include <linux/hdreg.h>
 #include <linux/fs.h>
+#include <linux/cdrom.h>
 #include <arpa/inet.h>
 
 #include "libudev.h"
@@ -210,6 +211,16 @@ static int disk_identify (struct udev *udev,
 		goto fail;
 	}
 
+	/*
+	 * do not confuse optical drive firmware with ATA commands
+	 * some drives are reported to blank CD-RWs
+	 */
+	if (ioctl(fd, CDROM_GET_CAPABILITY, NULL) >= 0) {
+		errno = EIO;
+		ret = -1;
+		goto fail;
+	}
+
 	/* So, it's a block device. Let's make sure the ioctls work */
 	if ((ret = ioctl(fd, BLKGETSIZE64, &size)) < 0)
 		goto fail;