VirtualBox最早是德国一家软件公司InnoTek所开发的虚拟系统软件,后来被Sun收购,改名为Sun VirtualBox,性能有很大的提高.因为他是开源的,不同于VM,而且功能强大,可以在 Linux/Mac 和 Windows 主机中运行, 并 支持在其中安装 Windows (NT 4.0、2000、XP、Server 2003、Vista)、DOS/Windows 3.x、Linux (2.4 和 2.6)、OpenBSD 等系列的客户操作系统.假如你曾经有用过虚拟机软件的经历的话，相信使用 VirtualBox 不在话下。即便你是一个新手，也没有关系。VirtualBox 提供了详细的文档，可以助你在短期内入门。
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VirtualBox 3.0.12 (released 2009-11-17)
This is a maintenance release. The following items were fixed and/or added:
- VMM: reduced IO-APIC overhead for 32 bits Windows NT/2000/XP/2003 guests; requires 64 bits support (VT-x only; bug )
- VMM: fixed double timer interrupt delivery on old Linux kernels using IO-APIC (caused guest time to run at double speed; bug )
- VMM: reinitialize VT-x and AMD-V after host suspend or hibernate; some BIOSes forget this (Windows hosts only; bug )
- VMM: fix loading of saved state when RAM preallocation is enabled
- BIOS: ignore unknown shutdown codes instead of causing a guru meditation (bug )
- GUI: never start a VM on a single click into the selector window (bug )
- Serial: reduce the probability of lost bytes if the host end is connected to a raw file
- VMDK: fix handling of split image variants and fix a 3.0.10 regression (bug )
- VRDP: fixed occasional VRDP server crash
- Network: even if the virtual network cable was disconnected, some guests were able to send / receive packets (E1000; bug )
- Network: even if the virtual network cable was disconnected, the PCNet card received some spurious packets which might confuse the guest (bug )
- Shared folders: fixed changing case of file names (bug )
- Windows Additions: fix crash in seamless mode (contributed by Huihong Luo)
- Linux Additions: fix writing to files opened in O_APPEND mode (bug )
- Solaris Additions: fix regression in guest additions driver which among other things caused lost guest property updates and periodic error messages being written to the system log
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