回复：请教各位大侠一个问题，谢谢了

1) 我有一个laptop harddrive 坏了，打算把旧的desktop 的硬盘做为external harddriver. 但没有办法boot up,errors 100c.请问如何解决问题。
-- 进入BIOS/SETUP, 改成从USB启动 but you have to install Windows in the HD first.

2)我将坏的laptop harddriver 放在u***** External hard driver能读到。是真坏了吗
-- It is possible that there are issues in boot sector only. Check by Disk Management or other programs. If checked ok, I would suggest you copy out the data you need, put it back to laptop and then repair the boot sector or reinstall Windows.