Before using Partition Assistant we highly recommend you do a complete defragment on the partition which you want to resize. The built-in defragment tool could assist you achieve this goal. Here are two methods of "How to defragment partition in Windows OS".

Method 1: Use the Properties of Your Local Disk

  1. Open My Computer.
  2. Right-click the local disk volume that you want to defragment, and then click Properties.
  3. On the Tools tab, click Defragment Now.
  4. Click Defragment.

Method 2: Use Computer Management MMC

  1. Start Computer Management MMC (Compmgmt.msc).
  2. Click Disk Defragmenter.
  3. Click the volume that you want to defragment, and then click Defragment.

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