|The windows disk defragmenter is best used in safe mode for an uninterrupted defrag.
| p5p
Fascinating that p5p (5 messages posted) is telling this to Mac (1749 messages posted).
You are correct--if you are having problem running a M$ disk utility.
Before running Defrag (or Scandisk),
most folks do an Apollo 13 (shut down running apps).
Anything that tries to write to the HDD (e.g., virtual memory)
is going to cause a problem.