Stefan Pendl

Constant volume dirty on boot even if drive is not dirty. Windows XP

The ultradefrag.exe is the GUI application. The udefrag.exe is the console (command prompt) application. The rest are support files.

In the settings tab is the option "execute missed tasks" or similar activated? This would allow resumming missed tasks as soon as possible. Stefan

Are you both using Windows 10 with feature update 1809 or are you using different releases? If you disable running in any case and use the SYSTEM account the task will never run, since the user is never logged on. It also depends on things like using tools that might optimize (tweak) your system settings, but in reallity they just hinder Windows to work properly. If possible I would delete and recreate the schduled task. Stefan

With latest releases of Windows 10 and Server 2016 it seems that the System user is no longer a garanty to have full administrative rights, even enabling "run with highest permissions" doesn't change this. It seems that running as "regular" administrative user with highest permissions enabled works as before. You may try that if the scheduled task fails again. Stefan

When Windows is running, many parts of the disk are locked. Use gPartEd to shrink the partition, since it will be able to move all files, bacause Windows is not active and therefore cannot lock any parts on disk. The sizes depend on what you will do with each O/S and what size the physical disk has. May be separate in 50% parts. Stefan

Thanks Stefan, In Linux Mint install there is the option to install alongside the existing OS, so Mint does the partitioning. Or is this what you mean by Windows doing the partitioning? You think manual partitioning with Gparted is better? What size should I make the partition/s?

When Windows is running, many parts of the disk are locked. Use gPartEd to shrink the partition, since it will be able to move all files, bacause Windows is not active and therefore cannot lock any parts on disk. Stefan