How to Calculate the Total Size of a Windows Drive Using Go?

Calculating the Total Size of a Drive in Go on Windows

To obtain the total size of a specific drive in Go on Windows, the standard Windows API call to be used is GetDiskFreeSpaceExW() from kernel32.dll. This function retrieves the free space available to the caller, along with the total number of bytes on the disk and the total number of free bytes.

By providing pointers for each piece of information required, the GetDiskFreeSpaceExW() function can be utilized to retrieve the total size of a drive.

Here's an example code demonstrating its usage:

import (
    "syscall"
    "unsafe"
    "fmt"
)

func main() {
    kernelDLL, _ := syscall.LoadDLL("kernel32.dll")
    GetDiskFreeSpaceExW, _ := kernelDLL.FindProc("GetDiskFreeSpaceExW")

    var free int64
    var total int64
    var avail int64

    path := "c:\"
    r1, r2, lastErr := GetDiskFreeSpaceExW.Call(
        uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),
        uintptr(unsafe.Pointer(&free)),
        uintptr(unsafe.Pointer(&total)),
        uintptr(unsafe.Pointer(&avail)),
    )

    fmt.Println(r1, r2, lastErr)
    fmt.Println("Free:", free, "Total:", total, "Available:", avail)
}

Running the above code will generate an output similar to:

1 0 Success.
Free: 16795295744 Total: 145545281536 Available: 16795295744

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