How to change the Local Disk name to "C"

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I have two internal hard disks in my laptop. The one in the default HDD slot has windows 7 and I'm planning to install windows 8.1 on the other one (ODD replacement) keeping the windows 7 as is. Now the windows 7 drive has the letter ":C". Now how do I change the new windows copy (Win 8.1) to Local disk C and the existing windows 7 drive to any other letter?

Please help me with this.
Note: I'm willing to install fresh copies of these two Windows OSs...
 
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You never get to assign the C: drive letter. Windows always assigns that letter to the HDD unit that it just booted from. Then it assigns other letters to other storage devices it finds. As Ironsounds said, you will need to choose which drive unit to boot from at each start-up, and that one automatically will become C: for that session.

His / her other recommendation was to "name" the drive. This does not refer to the letter name that Windows assigns. It refers instead to what is called the "Volume Name" that YOU get to assign at the time that a HDD unit is first initialized (or Partitioned, or Volume Created, or whatever your OS version calls it). For example, open My Computer and RIGHT-click on your C: drive and choose Properties. At...
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Ironsounds

Ironsounds

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Jul 31, 2011
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Hello... 1) You need to remove the WIN 7 drive and just install 8.1 on the new drive... Keep them separate... They are both C:\ drives now.
2) when you boot to your computer ...you need to hit a "F key" OR set the BIO's for the BOOT choice screen to allow manual Choice of Drive/OS you want to boot from.
3) You will be able to move/share files, Start programs, between the drives, if you want to... by giving permission to each one of the OS versions.
That is my method B )
 
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Hey Thanks,
After installing new windows and copy and both drives into the laptop, can I change one of the drive letter from "C" to any other letter?

FYI: I'm not going to use the Win 7 but need it for the power management options to preserve battery life. The power management just doesn't work win windows 8.1 as my laptop is a discontinued one. So I want to keep only one C disk and change the other one (win 7) to some another letter like Q or X or something else.
 
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Ironsounds

Ironsounds

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Jul 31, 2011
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Hello... You Don't need to change anything... That will break things!!! BUT... Name the drive Like "Win8.1" and "Win7" so you don't get confused between file locations... Windows will automatically create the D:/ drive "location" when it boots... If not check back for a FIX B )
 
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Paperdoc

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Oct 19, 2006
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You never get to assign the C: drive letter. Windows always assigns that letter to the HDD unit that it just booted from. Then it assigns other letters to other storage devices it finds. As Ironsounds said, you will need to choose which drive unit to boot from at each start-up, and that one automatically will become C: for that session.

His / her other recommendation was to "name" the drive. This does not refer to the letter name that Windows assigns. It refers instead to what is called the "Volume Name" that YOU get to assign at the time that a HDD unit is first initialized (or Partitioned, or Volume Created, or whatever your OS version calls it). For example, open My Computer and RIGHT-click on your C: drive and choose Properties. At the top is a rectangle with the current Volume Name of that unit. Mine says "BootDisk" because that's what I set at its beginning. Note that this name is limited to 8 characters. You CAN change what yours has now if you wish. You can set the Volume Name on your new HDD when setting it up. They are handy reminders which is which.
 
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