Some defragmentation utilities try to keep smaller files within a single directory together, as they are often accessed in sequence.ĭefragmentation is advantageous and relevant to file systems on electromechanical disk drives ( hard disk drives, floppy disk drives and optical disk media). It also attempts to create larger regions of free space using compaction to impede the return of fragmentation. It does this by physically organizing the contents of the mass storage device used to store files into the smallest number of contiguous regions (fragments, extents). In the maintenance of file systems, defragmentation is a process that reduces the degree of fragmentation. You may also reclaim available disk space manually by following instructions from KB114654.Visualization of fragmentation and then of defragmentation Once Windows triggers TRIM for its disks, Parallels Desktop detects it and resizes *.hdd accordingly.In the opened window you may run optimization manually (1), and configure disk optimization frequency (2): (In Windows 7 VM this window is called Disk Defragmenter) In Windows 8.1 or 10 VM click on Start button > type Optimize Drives > select Defragment and Optimize Drives.Go to Options > Optimization > check the Free Space: Real-time virtual disk optimization option. NOTE: Real-time virtual disk optimization may affect a virtual machine's performance while doing the compacting (not constantly).

Go to Hardware > Hard Disk 1 > check the Free Space: Real-time virtual disk optimization option. In this case, the option to enable TRIM will not be presented in the configuration window of the virtual machine because for NVMe disks TRIM should be always working, due to the design of the driver. Note: Parallels Desktop 15 provides you the ability to create virtual machines with NVMe virtual hard drives. Go to Hardware > Hard Disk 1 > unwrap Advanced Settings > check the Enable TRIM option.

To enable the real-time optimization on the traditional HDD drive you need to shut down your VM -> open your virtual machine's configuration.

This feature is enabled by default if your Mac's primary hard drive is an SSD drive, and it is available for Windows 7, 8, 8.1 and 10 virtual machines and the OS X virtual machines starting from 10.8 Mountain Lion. But you can also optimize drives on your PC manually. The real-time disk optimization feature relies on a TRIM command, which is used in Windows by Optimize Drives option (previously called Disk Defragmenter), and by default runs automatically on a weekly schedule. We have created a feature that takes care of that for you. Since Parallels Desktop version 10 you no longer need to think about the unused disk space in your Windows virtual machine (VM).

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