Disk monitor

A disk monitoring utility for Windows.

Installation

1. Make sure you have Go installed (version 1.18 or higher)

2. Create a new directory for the project:

mkdir disk-monitor
cd disk-monitor

3. Initialize a Go module:

go mod init disk-monitor

4. Install dependencies:

go get github.com/gizak/termui/v3

5. Save the code from the first artifact into a file called main.go

6. Build the program:

go build -o disk-monitor.exe main.go

Usage

Collecting disk data

Just run the program without any arguments:

disk-monitor.exe

The program will:

• Scan all available drives
• Show info for each drive (total size, free space, used space)
• Save the data to disk_monitor_history.json in the user's home folder
• Append new entries to that file every time you run it

Viewing the graph

To display a graph of free space over time, use the -graph flag:

disk-monitor.exe -graph

The graph shows:

• Different colored lines for each drive
• Free space in gigabytes on the Y axis
• Measurement numbers on the X axis
• Dates and times of each measurement at the bottom
• A legend with color coding for the drives

Press any key to exit graph mode.

Automation

You can set up automatic runs using Windows Task Scheduler:

1. Open Task Scheduler
2. Create a new task
3. Set up a trigger (e.g. daily or at logon)
4. In Actions, point it to disk-monitor.exe

Data format

Data is stored in JSON format at %USERPROFILE%\disk_monitor_history.json:

{
  "snapshots": [
    {
      "timestamp": "2024-01-15T10:30:00Z",
      "disks": [
        {
          "drive": "C:\\",
          "total_space": 500000000000,
          "free_space": 150000000000,
          "used_space": 350000000000
        }
      ]
    }
  ]
}

Notes

• The program uses Windows API to get disk info, so it only works on Windows
• The graph looks best in terminals that support Unicode and colors (Windows Terminal, ConEmu, etc.)
• If your terminal doesn’t support fancy rendering, the graph might look messed up