diff --git a/agent/src/collectors/smart.rs b/agent/src/collectors/smart.rs
index a5bd955..3db0dfb 100644
--- a/agent/src/collectors/smart.rs
+++ b/agent/src/collectors/smart.rs
@@ -28,6 +28,23 @@ impl SmartCollector {
         }
     }
 
+    async fn is_device_mounted(&self, device: &str) -> bool {
+        // Check if device is mounted by looking in /proc/mounts
+        if let Ok(mounts) = tokio::fs::read_to_string("/proc/mounts").await {
+            for line in mounts.lines() {
+                let parts: Vec<&str> = line.split_whitespace().collect();
+                if parts.len() >= 2 {
+                    // Check if this mount point references our device
+                    // Handle both /dev/nvme0n1p1 style and /dev/sda1 style
+                    if parts[0].starts_with(&format!("/dev/{}", device)) {
+                        return true;
+                    }
+                }
+            }
+        }
+        false
+    }
+
     async fn get_smart_data(&self, device: &str) -> Result<SmartDeviceData, CollectorError> {
         let timeout_duration = Duration::from_millis(self.timeout_ms);
 
@@ -274,6 +291,11 @@ impl Collector for SmartCollector {
 
         // Collect data from all configured devices
         for device in &self.devices {
+            // Skip unmounted devices
+            if !self.is_device_mounted(device).await {
+                continue;
+            }
+            
             match self.get_smart_data(device).await {
                 Ok(mut drive_data) => {
                     // Try to get capacity and usage for this drive