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Windows 7 启动失败 - GRUB rescue
C 盘满了，想扩大 C 盘容量。先删了 extended partition 中的一个与Ｃ盘相邻的逻辑硬盘（里面有虚拟机）后有了 Free Space，但用 Windows 7 内的 Storage Manage，不能缩小 extended partition 的空间。所以还是没有 Unallocated disk space 用来扩大Ｃ盘。仍然解决不了扩大 primary partition 的问题。（后来，用了 Gparted 光盘启动，轻松缩小了 extended partition。）然后就用 Windows 7 内建的 Storage manage 扩大了Ｃ盘。
这期间发生了一个插曲，就是删了逻辑硬盘之后，电脑不能启动了，显示 error file not found grub rescue。用下面的方法解决了：
1a. Insert the Windows 7 DVD or repair disk and restart your computer. Boot from the DVD, press a key if prompted.
1b. Or if you don’t have disks press F8 (or F2) instead repeatedly at boot and choose "Repair your computer" then go to step 4.
2. Choose your language and click Next.
3. Click Repair Your Computer and then select the operating system you want to repair.
4. Select Command Prompt and type the following commands (pressing Enter after each one):
bootrec /fixMBR
bootrec /fixBoot
bootrec /rebuildBCD
Note: there is a space before the /