在移动硬盘上装XP
终于在macrumos找到了在外接硬盘上装win的办法了，可惜只有usb的，火线硬盘貌似还不行。转贴一下，给大家参考
Booting Windows XP From An External DriveFrom Mac Guides(Redirected from Boot Camp Windows XP On External Drive)
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This article is based on a forum post written by mrichmon. Unlike Mac OS X, Windows XP is not designed to boot from external hard drives. Thus, getting XP to boot from an external drive to be used with your Intel Mac requires some work.
MacRumors user mrichmon reports having installed Windows XP SP2 successfully on an external USB drive using his MacBook to perform the install.
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Steps
Modify your Windows install CD to support booting from a USB drive. (Instructions on how to modify your Windows XP install CD)
把你的windows安装盘修改成支持从usb驱动器启动的模式。（如何修改的方法）
Remove the internal hard drive from the MacBook.
把macbook的内置硬盘拆掉。
Connect the external USB drive.
连接上usb外接硬盘。
Boot from the modified Windows install CD.
从修改过的windows安装盘上启动。
Progress through the Windows install, creating partitions and formatting the partitions as you see fit.
执行windows的安装过程，按照你的需要创建或格式化分区。
You may want to partition the drive under Mac OS X using a FireWire connection, since Disk Utility cannot always partition USB drives.
你可能需要用火线连接（外接）硬盘并在mac OS X下对硬盘进行分区，因为磁盘工具有时候会无法对usb硬盘进行分区。（这个问题现在貌似已经不用担心了。）
Wait for the Windows install to finish.
等待windows的安装结束。
Reboot into Windows on the external drive.
从外接硬盘上重新启动windows。
Install the Apple device drivers for Windows.
安装苹果针对windows的驱动程序。
Replace the internal drive.
换回（原来的）内置硬盘。
Note: Since a key step in this process is removing the internal drive, this process is best suited for MacBooks, since their hard drives are easily accessible.
注意 ：由于关键的步骤是拆除内置硬盘，因此这种方法最好用于mb上，因为它们的硬盘比较容易拆装。
After all of this you will be able to boot into Mac OS X.
在此之后你可以启动进入mac os X。
You will not be able to boot into Windows by holding down the option key when booting.
你不能通过在启动时按住option键来选择进入windows。
Instead you will need to connect the USB drive to a running Mac OS X system, open the Startup Disk Preference Pane and select the Windows partition. Then when you reboot you will boot into Windows.
你要做的是把这个usb硬盘连接到一个运行中的mac os X系统，然后打开“启动磁盘”设置从windows分区启动。这样当你重新启动时就会（自动）进入windows。
To return to OS X you need to use the Windows Startup Disk control panel to select Mac OS X.
要回到os X的话你需要在windows里的“启动磁盘”里选择从mac os X启动。
Mac OS X will also boot if the USB drive is not connected.
当usb硬盘没有连接的时候mac os X也会启动。
好几个论坛转载的，不知道原出处是哪里，无法署名作者