How to Get a Windows Drive\'s Total Size Using Go?

Querying Drive Total Size in Windows using Go

Obtaining the total size of a drive is crucial for various applications. This article demonstrates how to retrieve this information using the standard Windows API call in Go.

As previously mentioned, the GetDiskFreeSpaceExW() function from kernel32.dll can be employed. It takes a directory path as input and provides three output parameters:

• lpFreeBytesAvailableToCaller: Free bytes accessible to the caller
• lpTotalNumberOfBytes: Total disk size
• lpTotalNumberOfFreeBytes: Unused space on the disk

To utilize this function, allocate variables for the desired output:

import "syscall"

kernelDLL := syscall.MustLoadDLL("kernel32.dll")
GetDiskFreeSpaceExW := kernelDLL.MustFindProc("GetDiskFreeSpaceExW")

var free, total, 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)),
)

Example output:

Free: 16795295744 Total: 145545281536 Available: 16795295744

This technique enables you to accurately determine the total size of any specified drive using the Windows API.

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