1.    22 Jun 2016 #1
    Join Date : Oct 2014
    Posts : 2,504
    W10 Pro + W10 Preview

    2 Off "C" drives


    I have two SSDs both of which are mounted on separate "C" Drives.....W8.1 on one and W10 on the other.
    To create extra space on W10 have decided to format the W8.1.
    Have tried changing the drive letter in W8.1 so that I can open with W10 in order to format W8.1....drive letter change not possible, format greyed out.
    Neither M$ Disk management or CCleaner could perform this task.
    Any ideas would be appreciated.
      My ComputersSystem Spec
  2.    22 Jun 2016 #2
    Join Date : Jul 2015
    PA, USA
    Posts : 476
    Windows 10 Pro (Mix of Builds) / Linux Mint

    It shouldn't matter, the win 10 OS when booting will assign drive letters to both, and the one that it boots from will be C:

    Boot it up with your 10 and the extra ...
      My ComputerSystem Spec
  3.    22 Jun 2016 #3
    Join Date : Oct 2014
    Posts : 2,504
    W10 Pro + W10 Preview
    Thread Starter

    I can boot up separately with each but when I connect the two together it only recognises W10.
      My ComputersSystem Spec
  4.    22 Jun 2016 #4
    Join Date : Jul 2015
    PA, USA
    Posts : 476
    Windows 10 Pro (Mix of Builds) / Linux Mint

    What does disc management show for the extra drive when booted into 10?

    You should be able to reformat, allocate space, etc.
      My ComputerSystem Spec
  5.    22 Jun 2016 #5
    Join Date : Oct 2014
    Posts : 2,504
    W10 Pro + W10 Preview
    Thread Starter

    As stated already extra drive W8.1 does not appear when booting from W10.
    I must emphasise I only wish to format W8.1.
      My ComputersSystem Spec
  6.    22 Jun 2016 #6
    Join Date : Mar 2015
    Stockport UK
    Posts : 2,961
    Wndows 10 x64 Home version 1709

    Have you tried booting into safe mode with command prompt on the Windows 8.1 drive and run a format command?
      My ComputerSystem Spec
  7.    22 Jun 2016 #7
    Join Date : Jul 2014
    Serbia
    Posts : 10,634
    W10 Insider + Linux
      My ComputersSystem Spec
  8.    22 Jun 2016 #8
    Join Date : Oct 2014
    Posts : 2,504
    W10 Pro + W10 Preview
    Thread Starter

    Reasoning on my part suggests you cannot remove an O/S while it is operational.
    Have finally solved the problem, or rather M$ solved it.
    As already stated each SSD worked perfectly on their own.
    After trying to get either to recognise the other.....at the third attempt Windows started to correct faults on W8.1 then started to correct faults on W10.....from there it was easy to change the disk letter on W8.1 to "E" then restart the computer with W10 to format W8.1.
    My Thanks to all who replied.
      My ComputersSystem Spec
  9.    22 Jun 2016 #9
    Join Date : Mar 2015
    Stockport UK
    Posts : 2,961
    Wndows 10 x64 Home version 1709

    Happy to hear you got it sorted out dencal
      My ComputerSystem Spec

 


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