<%NUMBERING1%>.<%NUMBERING2%>.<%NUMBERING3%> PRTG Manual: Share Disk Free Sensor

The Share Disk Free sensor monitors free disk space of a share (Windows/Samba) using Server Message Block (SMB).

Share Disk Free Sensor

Share Disk Free Sensor

i_square_cyanFor a detailed list and descriptions of the channels that this sensor can show, see section Channel List.

Sensor in Other Languages

  • Dutch: Share Disk Ruimte
  • French: Espace disponible du disque partagé
  • German: Freigaben-Speicherplatz
  • Japanese: 共有ディスク空き容量
  • Portuguese: Disco livre para compartilhamento
  • Russian: Свободное дисковое пространство общего ресурса
  • Simplified Chinese: 共享的磁盘可用空间
  • Spanish: Espacio libre en disco compartido


Consider the following remarks and requirements for this sensor:



LanmanServer service

  • This sensor requires that the LanmanServer service runs on the target system.

i_round_blueThe display name of the service is Server.

  • To enable the service, log in to the respective system and open the services manager (for example, via services.msc). In the list, find the respective service and set its Start Type to Automatic.


  • This sensor only works if no quotas are enabled on the target share. If there are quotas enabled for the user account that this sensor uses to connect to the share, the absolute value is okay, but the percentage variable shows incorrect values.

Share name

  • You can only enter a share name, for example, C$. Do not enter a complete Universal Naming Convention (UNC) name. The sensor takes the server name \\server\ from the parent device.


  • This sensor supports IPv6.

Performance impact

  • This sensor has a medium performance impact.

Knowledge Base

Hosted probe

i_podYou cannot add this sensor to the hosted probe of a PRTG Hosted Monitor instance. If you want to use this sensor, add it to a remote probe device.

Basic Sensor Settings

Basic Sensor Settings

Basic Sensor Settings

The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:

  • diskspacesensor
  • smbdiskspacesensor

i_square_cyanFor more information about basic sensor settings, see section Sensor Settings.

Share Configuration

Share Configuration

Share Configuration




The name of the share that this sensor monitors.

Sensor Display

Sensor Display

Sensor Display



Primary Channel

Select a channel from the list to define it as the primary channel. In the device tree, PRTG displays the last value of the primary channel below the sensor's name. The available options depend on what channels are available for this sensor.

i_round_blueYou can set a different primary channel later by clicking b_channel_primary below a channel gauge on the sensor's Overview tab.

Graph Type

Define how this sensor shows different channels:

  • Show channels independently (default): Show a graph for each channel.
  • Stack channels on top of each other: Stack channels on top of each other to create a multi-channel graph. This generates a graph that visualizes the different components of your total traffic.
    i_round_redYou cannot use this option in combination with manual Vertical Axis Scaling (available in the channel settings).

Stack Unit

This setting is only visible if you select Stack channels on top of each other above.

Select a unit from the list. PRTG stacks all channels with this unit on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so.

Inherited Settings

By default, all of these settings are inherited from objects that are higher in the hierarchy. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click b_inherited_enabled under the corresponding setting name to disable the inheritance and to display its options.

i_square_cyanFor more information, see section Inheritance of Settings.

Channel List

i_round_blueWhich channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.




In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status

Free Bytes

The free space

Free Space

The free space (%)

i_round_blueThis channel is the primary channel by default.


i_square_blueKNOWLEDGE BASE

What can I do if PRTG doesn't succeed with monitoring a share? PE029 PE032

What security features does PRTG include?