diff --git a/src/cryptobox/core/blockdevice.py b/src/cryptobox/core/blockdevice.py
index ea0b2ad..0ebe35f 100644
--- a/src/cryptobox/core/blockdevice.py
+++ b/src/cryptobox/core/blockdevice.py
@@ -46,8 +46,10 @@ LOGGER = logging.getLogger("CryptoNAS")
 DEFAULT_SYSBLOCK_DIR = '/sys/block'
 DEFAULT_DEVNODE_DIR = '/dev'
 MINIMUM_STORAGE_SIZE = 10
+# defined device numbers: http://www.lanana.org/docs/device-list/devices.txt
 MAJOR_DEVNUM_LOOP = 7
 MAJOR_DEVNUM_FLOPPY = 2
+MAJOR_DEVNUM_RAMDISK = 1
 MAJOR_DEVNUM_MD_RAID = 9
 
 ## cache settings
@@ -233,6 +235,9 @@ class Blockdevice:
             ## otherwise we would have a long timeout, while reading the devices
             if (self.major == MAJOR_DEVNUM_FLOPPY):
                 return False
+            # we don't want to store data in ramdisks (e.g. /dev/ram0)
+            if (self.major == MAJOR_DEVNUM_RAMDISK):
+                return False
         except TypeError:
             return False
         return True