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It is possible to have Windows 7/8.1/10 reside on a volume with driver letter other than C: ? I hope to have this so that I can test whether my softwares/installers can run correctly when the system stock directories are not standard, for example, F:\Windows , F:\Program Files, F:\Program Files (x86), F:\ProgramData .

When installing from ISO, I Shift+F10 call out diskpart.exe, create partitions and assign letter F: to the 12GB partition then install Win7 on it. BUT, when installation is done, that 12GB partition still gets drive letter C:, sigh.

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Trying to change drive letter from diskmgmt.msc is vain, Windows says The parameter is incorrect.

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  • Did you try to create a partition with the drive letter C and not install to it? In your example e.g. you could assign volume 2 the drive letter C. – Seth May 9 '17 at 7:24
  • Tried it. Same result. – Jimm Chen May 9 '17 at 7:41
  • You cannot change the partition letter the OS boots from. – Overmind May 9 '17 at 7:43
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No, it is not possible with any unaltered installation kit. The letter C: is reserved for the drive or partition that the windows operating system is installed on. If you multi boot, then the windows that you start in will always show as the C: drive by default. Windows practically always assigns C: to itself when booting, no matter your partition configuration is. For example, if you have 2 partitions with W7 and W10, if you boot from drive with W7, that one would be C: and other one D:. In the same computer, if you now boot from drive with W10 and it will become C: and drive with W7 will become drive D:.

  • Then where can I get the "altered installation kit"? from Microsoft? – Jimm Chen May 9 '17 at 8:53
  • You will have to make your own. Tools like NLite/Rt7Lite, WinPE, WinReducer (for W10) and many similar ones can help you do that. – Overmind May 9 '17 at 11:15

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