请问system memory resources 和 device-accessible resources 的区别

onunix

system memory resources 和 device-accessible resources 有什么区别，前者是内存，后者是硬盘？ 参见

For managed texture resources, the resource creation process ends here. For non-managed texture resources, an application promotes system memory resources to device-accessible resources (for hardware acceleration) by calling IDirect3DDevice9::UpdateTexture.