VirtualBox 5.0 正式发布，此版本包括重要的新特性，大量改进和 bug 修复。

VirtualBox 5.0 支持最新的 guest/host 操作系统：Mac OS X Yosemite, Windows 10, Oracle Linux, Oracle Solaris, 其他 Linux 操作系统和传统操作系统。

值得关注的改进：

部分虚拟化支持，Windows 和 Linux Guests
优化 CPU 利用率
支持 USB 3.0 设备
Windows 上支持双向拖拽
硬盘镜像加密：使用工业标准 AES 算法

其他改进：

VMs can now be started in separate mode. The VM process is started headless while the frontend runs as a separate process which can be terminated without stopping the VM.
GUI: VM guest-content scaling support (including 3D acceleration)
GUI: New User Interface settings page for customizing status-bar, menu-bar and guest-content scaling
GUI: New Encryption settings tab for customizing encryption options for disk images
GUI: HiDPI support including application icons and optional unscaled HiDPI output on Mac OS X (including 3D acceleration)
GUI: Hotplugging support for SATA disks

New, modular audio architecture for providing a better abstraction of the host audio backends
Support for the NDIS6 networking framework on Windows (default on Vista and later)

未来 GUI 改进：

VM guest-content scaling support (including 3D acceleration)
New User Interface settings page for customizing status-bar, menu-bar and guest-content scaling
New Encryption settings tab for customizing encryption options for disk images
HiDPI support including application icons and optional unscaled HiDPI output on Mac OS X (including 3D acceleration)
Hotplugging support for SATA disks
Improved HID LEDs synchronization for Mac and Windows hosts
Take the guest screen aspect ratio into account for the preview window
Provide direct access to storage media in the VM selector

下载：http://download.virtualbox.org/virtualbox/5.0.0/

啥时候换到qt5上我就满足了

...我比較關心這個...

Storage: added USB mass storage device class (see Section 5.1, “Hard disk controllers: IDE, SATA (AHCI), SCSI, SAS, USB MSC”)


The USB mass storage device class is a standard to connect external storage devices like hard disksor flash drives to a host through USB. All major operating systems support these devices for a long time and ship generic drivers making third-party drivers superfluous. In particular legacy operating systems without support for SATA controllers may benefit from USB mass storage devices.
The virtual USB storage controller offered by VirtualBox works different than the other storage controller types: When storage controllers appear as a single PCI device to the guest with multiple disks attached to it, the USB-based storage controller does not appear as virtual storage controller. Each disk attached to the controller appears as a dedicated USB device to the guest.
Warning
Booting from drives attached via USB is not supported as the BIOS lacks USB support.

没有看明白到底啥意思，有明白人给说一下。