diff --git a/ec2/spark_ec2.py b/ec2/spark_ec2.py
index e80f928b8beb..5da4edf7272a 100755
--- a/ec2/spark_ec2.py
+++ b/ec2/spark_ec2.py
@@ -220,6 +220,8 @@ def get_spark_ami(opts):
         "cg1.4xlarge": "hvm",
         "hs1.8xlarge": "hvm",
         "hi1.4xlarge": "hvm",
+        "m3.medium":   "hvm",
+        "m3.large":    "hvm",
         "m3.xlarge":   "hvm",
         "m3.2xlarge":  "hvm",
         "cr1.8xlarge": "hvm",
@@ -544,8 +546,10 @@ def get_num_disks(instance_type):
         "hs1.8xlarge": 24,
         "cr1.8xlarge": 2,
         "hi1.4xlarge": 2,
-        "m3.xlarge":   0,
-        "m3.2xlarge":  0,
+        "m3.medium":   1,
+        "m3.large":    1,
+        "m3.xlarge":   2,
+        "m3.2xlarge":  2,
         "i2.xlarge":   1,
         "i2.2xlarge":  2,
         "i2.4xlarge":  4,