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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.