Diskmon Explained:

DiskMon is a lightweight utility from Microsoft’s Sysinternals suite that logs and displays all hard disk activity on a Windows system in real time. It functions both as a detailed technical logger and as a software-based disk activity light in your system tray. 🛠️ How to Download and Launch DiskMon

Because DiskMon is a portable application, it does not require a standard installation process.

Download the tool directly from the Official Microsoft Sysinternals DiskMon Page. Extract the downloaded ZIP file to a folder of your choice.

Right-click diskmon.exe and select Run as Administrator to give it the permissions required to hook into kernel event tracing. 📊 Reading the Data Columns

Once launched, DiskMon immediately starts capturing read and write transactions. The main window populates with several columns:

Time: The exact time of the transaction, or the duration of the event in microseconds depending on your settings.

Duration: The length of time the disk took to complete the specific I/O request.

Device: The number designation of the physical drive being accessed (e.g., Disk 0, Disk 1).

Area: The action type, explicitly mapping whether the event is a Read or a Write operation.

Sector: The starting location on the disk where the operation happened. DiskMon presents read and write offsets in terms of standard 512-byte sectors.

Length: The volume of data being processed, measured in sectors. ⚙️ Core Features and Customization

Pause and Resume: Click the Magnifying Glass icon on the toolbar to instantly toggle data capturing on or off.

Exporting Logs: You can export the captured list view into a standard ASCII text file by clicking the Save button. These logs can then be cleanly imported into tools like Microsoft Excel to calculate total disk usage metrics over time.

Adjusting History Depth: To avoid high memory consumption during long tracking sessions, use the History Depth dialog box to set the maximum number of rows kept in the graphical interface (setting it to 0 allows unlimited logging). 💡 Using DiskMon as a System Tray Disk Light

If your computer case lacks a physical hard drive LED light, you can configure DiskMon to act as a virtual light in your Windows system tray.

Manual Setup: Navigate to Options in the top menu and select Minimize to Tray.

Visual Status: The tray icon will actively blink Green during disk-read activity and Red during disk-write activity. Double-clicking this tray icon immediately restores the main logging window.

Automated Startup Switch: To ensure it launches silently into your system tray every time Windows boots, create a shortcut in your Program Files\Startup folder. Edit the shortcut’s properties and add the /l (lowercase L) flag outside of the quotation marks in the Target field:“C:\Sysinternals Tools\diskmon.exe” /l

If you are tracking down a specific performance issue, let me know what problem you are trying to solve (like diagnosing 100% disk usage or tracking a specific app) so I can guide you to the right settings! DiskMon – Sysinternals – Microsoft Learn