Windows-API-examples/system/get_drives.c

#include <windows.h>
#include <wchar.h>

int wmain(void) {

    wchar_t LogicalDrives[MAX_PATH] = {0};
    DWORD r = GetLogicalDriveStringsW(MAX_PATH, LogicalDrives);
    
    if (r == 0) {
        wprintf(L"Failed to get drive names %ld", GetLastError());
        return 1;
    }

    if (r > 0 && r <= MAX_PATH) {
    
        wchar_t *SingleDrive = LogicalDrives;
        
        while(*SingleDrive) {
            wprintf(L"%ls\n", SingleDrive);

            SingleDrive += wcslen(SingleDrive) + 1;
        }
    }

    return 0;
}