change disk cleanup to ignore traditional hdd's

install/usr/local/bin/disk-maintenance

@@ -33,8 +33,8 @@ for filesystem in $(mount -t ext4 | awk '{print $3}'); do
 	cleanup_ext4 "$filesystem" &
 done
 
-# defragment and rebalance btrfs weekly
-for filesystem in $(mount -t btrfs | awk '{print $3}'); do
+# defragment and rebalance ssd-only (hdd are too slow) btrfs weekly
+for filesystem in $(mount -t btrfs | grep "ssd" | awk '{print $3}'); do
 	cleanup_btrfs "$filesystem" &
 done