解决：

第1种方法

加上 /d 参数即可。如：

cd /d d:/myspace


默认cd命令只能在当前分区切换，要换到其他分区，必须在前面加上 /d 参数。

第2种方法

直接输入 d: 就可以进入到d盘，其他磁盘也是如此。

    在windows下切换目录想必大家都试过，但依然有一个需要注意的地方。
   那就是在切换不同盘时，cd就不管用了。
   在处于c盘目录下时，输入cd d:，跳转一下就又跳了回来。
   当时还有些奇怪，然后百度了一下，发现是切换的方式错了，这个cd是只能在当前盘内切换目录的，想要切换到其它盘，直接输入d:这样就行了。

bcdboot
Disclaimer: It's very likely that I have NO idea what I'm talking about. This is a blog, not a technical article or official anything. Listening to me may well kill your pet kitten and render both your computer and you personally unbootable. Run away in fear as this is all completely useless information.
  
免责声明：我很可能不知道我在说什么。 这是一个博客，而不是技术文章或任何官方文章。 听我的话很可能会杀死您的宠物小猫，并使您的计算机和个人无法启动。 逃避恐惧，因为这完全是无用的信息。
I paved (reformatted and started over) my main machine, formerly named QUADPOWER, now QUADPOWER7 to use the new Windows 7 RC a few days ago. I went through the process, but wasn't really paying attention. I have a tendency to just Next>Next>Next>Finish my way through most wizards. This will likely be the death of me at some point. 
  
 我为主机(以前命名为QUADPOWER，现在为QUADPOWER7)铺平(重新格式化并重新开始)，以便几天前使用新的Windows 7 RC 。 我经历了整个过程，但并没有真正注意。 我倾向于通过大多数向导完成“下一步”>“下一步”>“下一步”>。 在某些时候，这可能是我的死亡。
Anyway, my system is a little non-standard and I had at some point a year ago switched hard drives around to make the faster one be my boot drive. I did this by changing the boot order in the BIOs. 
  
 无论如何，我的系统有点不符合标准，一年前的某个时候我不得不更换硬盘驱动器以使更快的硬盘成为我的启动驱动器。 我通过更改BIO中的启动顺序来做到这一点。
Fast forward a bit, and today I wanted to format my DATA drive - my D: drive - and the format applet said "not so fast."
  
 快一点，今天我想格式化我的DATA驱动器-我的D：驱动器-格式小程序说“不是那么快”。
I opened up Disk Management and it showed me this...
  
 我打开了磁盘管理，它向我显示了这个...
Yikes! See how my D: drive is Disk 0 and is marked as System, but my C: drive is Disk 1 and marked as Boot? That means that the Boot Configuration Data (BCD) is on my D: drive. I checked my BIOs, and it turned out, in fact, that I had told it to boot of that drive. However, I'd installed Windows to the other drive and got myself into this situation:
  
 kes！ 看看我的D：驱动器是磁盘0并标记为系统，但我的C：驱动器是磁盘1并标记为引导吗？ 这意味着引导配置数据(BCD)位于我的D：驱动器上。 我检查了我的BIO，结果发现实际上我已告诉它启动该驱动器。 但是，我将Windows安装到另一个驱动器上，并使自己陷入这种情况：
Disk 0 - D: Drive with BCD 
 磁盘0-D：BCD驱动器
    
Disk 1 - C: Drive with C:\windows and other booty 
磁盘1-C：带有C：\ windows和其他赃物的驱动器
 
I couldn't format D: because it was what I booted off of. Poop.
  
我无法格式化D：因为这是我启动的内容。 船尾。
I searched around and found all sorts of hard and scary descriptions of how to fix this. Basically it boiled down to:
  
 我四处搜寻，发现了各种有关如何解决此问题的困难的描述。 基本上可以归结为：
Approach 1: Nuclear Option. Wipe and Start Over. 
  
 方法1：核选择。 擦拭并重新开始。
Approach 2: Copy the Hidden/System Boot Manager and Boot Folder over to the C: drive and run a tool called BCDEdit to move things around in 12 short steps. ;)
  
 方法2：将“隐藏/系统启动管理器”和“启动文件夹”复制到C：驱动器，并运行一个名为BCDEdit的工具，只需12个简短的步骤即可完成操作。 ;)
This was a scary prospect for me, because from my point of view, while this was a fairly advanced operation, I just wanted to switch where the boot info comes from.
  
 对于我来说，这是一个令人恐惧的前景，因为从我的角度来看，虽然这是一个相当高级的操作，但我只想切换启动信息的来源。
Turns out there is a new (profoundly advanced, you have been warned) command line tool called BCDBoot.
  
 事实证明，有一个名为BCDBoot的新(非常先进，已经警告您)命令行工具。 
C:\windows\system32>bcdboot /?

Bcdboot - Bcd boot file creation and repair tool.

The bcdboot.exe command-line tool is used to copy critical boot files to the
system partition and to create a new system BCD store.

bcdboot <source> [/l <locale>] [/s <volume-letter>] [/v]
                 [/m [{OS Loader ID}]]

  source            Specifies the location of the windows system root.

  /l                Specifies an optional locale parameter to use when
                    initializing the BCD store. The default is US English.

  /s                Specifies an optional volume letter parameter to designate
                    the target system partition where boot environment files are

                    copied.  The default is the system partition identified by
                    the firmware.

  /v                Enables verbose mode.

  /m                If an OS loader GUID is provided, this option merges the
                    given loader object with the system template to produce a
                    bootable entry. Otherwise, only global objects are merged.


Examples: bcdboot c:\windows /l en-us
          bcdboot c:\windows /s h:
          bcdboot c:\windows /m {d58d10c6-df53-11dc-878f-00064f4f4e08}

This means that I could type this from an Administrator Command Prompt:

 这意味着我可以从管理员命令提示符下键入：
bcdboot c:\windows /s c:

 bcdboot c：\ windows / sc：
And BCDBoot would basically re-gen the BCD stuff I needed on the C: drive given what it knows about the C:\Windows install. 

 如果BCDBoot对C：\ Windows安装有所了解，那么BCDBoot基本上可以重新生成C：驱动器上所需的BCD内容。
I ran it, and rebooted. I immediately went into the BIOS and changed the Boot Order so that my 300 GIG C: faster drive (the one I thought I was booting off of all the time) was my startup drive.

 我运行它，然后重新启动。 我立即进入BIOS并更改了启动顺序，以使我的300 GIG C：更快的驱动器(我认为我一直都在引导的驱动器)是我的启动驱动器。
Now, Disk Management shows that C:\ is both System and Boot and all is right with the world. 

 现在，“磁盘管理”显示C：\既是系统又是引导，并且一切正常。
More subtle awesomeness from Windows 7. 



            
 Windows 7更微妙的功能。
翻译自: https://www.hanselman.com/blog/switching-my-windows-7-boot-disk-from-d-to-c-with-bcdboot-rather-than-bcdedit
bcdboot