diff --git a/src/cloudron.js b/src/cloudron.js
index 062b7ee85..828d7e9c1 100644
--- a/src/cloudron.js
+++ b/src/cloudron.js
@@ -339,14 +339,14 @@ async function getBlockDevices() {
     let info;
 
     try {
-        info = JSON.parse(execSync('lsblk --paths --json --list --bytes', { encoding: 'utf8' }));
+        info = JSON.parse(execSync('lsblk --paths --json --list --fs', { encoding: 'utf8' }));
     } catch (e) {
         console.error('Failed to list disks:', e);
         throw new BoxError(BoxError.INTERNAL_ERROR, e);
     }
 
-    // remove empty disks (disks with partitions)
-    const devices = info.blockdevices.filter(d => d.size);
+    // filter only for ext4 disks
+    const devices = info.blockdevices.filter(d => d.fstype === 'ext4');
 
     debug(`getBlockDevices: Found ${devices.length} devices. ${devices.map(d => d.name).join(', ')}`);