# DiskMon - Sysinternals | Microsoft Learn

Here’s a concise summary of the DiskMon v2.02 article by Mark Russinovich (Published: October 12, 2021):

* What it is
  * DiskMon is a Windows utility that logs and displays all hard-disk activity. It can also run in the system tray as a “disk light” (green for reads, red for writes).
* How to get and run it
  * Download: <https://download.sysinternals.com/files/DiskMon.zip> (488 KB)
  * Run immediately from Sysinternals Live: <https://live.sysinternals.com/Diskmon.exe>
* Installation and basic use
  * No formal install—unzip and run diskmon.
  * GUI and toolbar let you enable/disable event capture, control scrolling, and save view contents to an ASCII file.
  * To run as a tray disk light: use Options | Minimize to Tray or start with the /l switch (e.g., diskmon /l).
  * Example startup shortcut target: "C:\Sysinternals Tools\Diskmon.exe" /l
  * Read/write offsets are shown in sectors (512 bytes). Events can be shown with duration (microseconds) or absolute start time.
  * History Depth setting controls maximum records kept in the GUI (0 = no limit).
* Implementation
  * DiskMon is built on kernel event tracing (based on TraceDmp), per the Microsoft Platform SDK.
* Additional
  * The page includes a screenshot and points to a related Microsoft training module: Maintain disks and volumes - Training.
  * Last updated: 10/12/2021

If you want, I can turn this summary into a short how-to stepper (install → run → configure) or extract the command/shortcut text into a code block.