Adjust Low Disk Space Warning Threshold in Regedit

Windows automatically alerts users when a drive runs low on storage capacity by displaying notification balloons. This guide provides a straightforward walkthrough on how to customize the low disk space notification threshold percentage using the Windows Registry Editor (Regedit), allowing you to define exactly when these warnings appear.

Step 1: Open the Registry Editor

  1. Press Windows Key + R to open the Run dialog box.
  2. Type regedit and press Enter or click OK.
  3. If prompted by User Account Control (UAC), click Yes to grant administrative privileges.

Step 2: Navigate to the Parameters Key

In the Registry Editor address bar or left-hand navigation pane, navigate to the following path:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters

Step 3: Create or Modify the DiskSpaceThreshold Value

  1. Check the right pane for an existing entry named DiskSpaceThreshold.
  2. If it does not exist:
    • Right-click an empty area in the right pane.
    • Select New > DWORD (32-bit) Value.
    • Name the new value DiskSpaceThreshold and press Enter.

Step 4: Set the Threshold Value

  1. Double-click the DiskSpaceThreshold entry to edit it.
  2. Under Base, select the Decimal radio button.
  3. In the Value data field, enter a number from 0 to 99. This number represents the percentage of free disk space remaining that triggers the notification (for example, entering 15 triggers the alert when free space drops below 15%).
  4. Click OK to save the changes.

Step 5: Apply the Changes

Close the Registry Editor and restart your computer (or restart the Server service via services.msc) for the new threshold to take effect.