Why does USB port change?

I have an HP laptop with Win 7 Home Premium OS.  it has only one USB port on the left side.  I use it to back up Quickbooks, save fills, HD backup etc to a flash drive.  Sometimes when I insert the flash drive the PC says it is the F drive and sometimes it says it is the G drive.  It seems to change randomly.

Why does it do that and how can I stop it from happening?  

My backup utilities and QB and other applications always first go to a designated drive so its a real hassle when it expects to send to the F drive but the PC has changed that USB port to G.



M3MetalAsked:
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JohnConnect With a Mentor Business Consultant (Owner)Commented:
What is likely happening is that you are not stopping the USB before ejecting, so it still thinks the USB key is still there. Try ejecting the USB with the Windows 7 eject tool (system tray or hidden in the double up arrow in the system tray). You should eject anyway (because some USB devices can be otherwise damaged), but try overtly ejecting and see if you get the same letter. I always do. ... Thinkpads_User
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AriMcCommented:
Have you tried setting the letter manually:

http://support.microsoft.com/?kbid=307844

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residentsCommented:
Also, I would recommend setting it to something further down the alphabet, such as U: (for USB) or whatever seems easy to remember. That way if other letters do become used up it will not need to mess with your USB drive letter.
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BCipolloneCommented:
I'm curious as to what the F: points to when it is labeling your USB as the G:

It has assigned something to that drive... Thinkpads may be right about the cause.
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M3MetalAuthor Commented:
I don't eject it before removing it.  I'll try that.  I've had SanDisk Cruzer Micro flash drives that ask/insist they be ejected before removing.  Without that overt request, I've always just removed them.  Seems like a good practice to eject first so I'll test that.  

I'll report back with test results in about 24 hours.
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M3MetalAuthor Commented:
Seems to do the trick.  Thanks.
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JohnBusiness Consultant (Owner)Commented:
You are most welcome and I was pleased to help out. ... Thinkpads_User
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