diff --git a/extensions/Servers/Proxmox/Livewire/Storage.php b/extensions/Servers/Proxmox/Livewire/Storage.php
index 339369d57..9f99d33e1 100644
--- a/extensions/Servers/Proxmox/Livewire/Storage.php
+++ b/extensions/Servers/Proxmox/Livewire/Storage.php
@@ -837,22 +837,34 @@ class Storage extends Component
             return;
         }
 
-        // Get next available index on target bus
-        $targetIndex = $this->getNextAvailableIndex($targetBus);
-        if ($targetIndex === null) {
-            $this->notify("No available slots for {$this->busTypes[$targetBus]['label']} drives.", 'error');
-            return;
-        }
-
         try {
             $proxmox = new Proxmox;
-            $targetKey = $targetBus . $targetIndex;
 
-            // Get current config to find next unused slot
+            // Get current config to check actual slot availability
             $config = $proxmox->request(
                 '/nodes/' . $this->server->node->name . '/qemu/' . $this->server->vm_id . '/config'
             );
 
+            // Find the next available slot on the target bus by checking actual Proxmox config
+            $maxIndex = $this->busTypes[$targetBus]['max'] ?? 4;
+            $targetIndex = null;
+            
+            for ($i = 0; $i < $maxIndex; $i++) {
+                $slotKey = $targetBus . $i;
+                // Check if this slot is occupied in the actual config
+                if (!isset($config['data'][$slotKey])) {
+                    $targetIndex = $i;
+                    break;
+                }
+            }
+
+            if ($targetIndex === null) {
+                $this->notify("No available slots for {$this->busTypes[$targetBus]['label']} drives.", 'error');
+                return;
+            }
+
+            $targetKey = $targetBus . $targetIndex;
+
             // Find the next available unused slot
             $unusedIndex = 0;
             while (isset($config['data']['unused' . $unusedIndex])) {