对当前技术的保守推断表明，每个书本大小的可移动硬盘(或者等价的非易失性内存芯片)能存储大约60兆字节。
Conservative extrapolation of current technology suggests that match-book size removable hard disks (or the equivalent nonvolatile memory chips) will store about 60 megabytes each.
基本上如果能得到可以启动的live CD版本，就可以将它应用到外部可移动硬盘而不是CD ！
Basically if you can get a bootable live CD version, you can use an external portable hard drive instead of a CD!
在我电脑里，我有一个每天都要用到的备份。另外，在可移动硬盘里我也保存了一份。
I have a copy on my computer which I access on a daily basis and a backed up copy in an external harddrive.
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