Adjust System Restore Storage Size Using Regedit

This guide explains how to configure the maximum disk space percentage allocated for System Restore points in Windows using the Registry Editor (Regedit). Modifying this setting allows you to control how much drive capacity is dedicated to storing restore points, helping you balance system recovery capabilities with available hard drive space.

Step 1: Open the Registry Editor

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

Step 2: Navigate to the System Restore Key

In the Registry Editor, navigate to the following path using the left-hand folder tree or by pasting it into the address bar at the top:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore

Step 3: Create or Modify the DiskPercent Value

  1. Look for a DWORD (32-bit) value named DiskPercent in the right-hand pane.
  2. If DiskPercent does not exist:
    • Right-click an empty space in the right pane.
    • Select New > DWORD (32-bit) Value.
    • Name the new value DiskPercent and press Enter.
  3. Double-click the DiskPercent value to open its properties.

Step 4: Set the Allocation Percentage

  1. Under the Base section, select the Decimal radio button.
  2. In the Value data field, enter the percentage of disk space you want to allocate for System Restore (for example, enter 5 for 5% or 10 for 10%).
  3. Click OK to save the changes.

Step 5: Restart Your Computer

Close the Registry Editor and restart your computer to apply the new storage allocation settings. System Restore will now respect the designated percentage limit when creating new restore points.