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Drive letter

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I had to format my new ssd after failed clone of windows 10 64 bit, as I could not start windows with drive in place. What my question is, now that I have formatted drive it must have a drive letter which is "K", what happens when I clone to this drive when original drive is "C" and how do I change new drive letter as I want it to be my new boot drive.

Regards Ed

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Ed, I'm assuming you formatted this on another machine which gave it the letter of K on it's own.  The drive letter assigend in one OS will have no bearing when the other drive is booted.  There can only ever be one drive letter C: which is the currently booted instance of the OS.  When you restore an image or create a clone and boot to the new drive, it will automatically be C: as that was the drive assigned to the OS as well.  Were you to have the other original disk installed at the same (which is a bad idea for booting purposes and confustion for the bios since they will appear to the bios as the same disk), the original drive would not show up as the C: drive and would take on a new letter as well.  

As far as cloning goes, please take a look at this post.  I would highly recommend that you always take a full backup before peformaing any major operation - even a clone.  An entire (good) backup can always be restored.  A clone offers no safety net and it is possible to clone in the wrong direction (blank drive overwrites the original) if you're not careful.  It's also possible that if you leave the original drive and the new clone drive attached and try to boot the OS, the bios will get confused when it sees 2 "identical" hard drives and can't decide what to do so it changes the MBR of the drives and makes them both unbootable as as aresult. 

And here's another of my posts regarding the differences of cloning vs backup/restore.  If you're going to take a safety backup anyway, you might as well just restore it instead of cloning. https://forum.acronis.com/forum/126072#comment-391792