Missing HD Space even after Erase and Install

Ok, so I own a 2.4GHz MBP, 200GB HD 7,200RPM, 4GB of memory... Penryn model that my brother purchased for the each of us back in about August of last year (2008). So recently my brother upgraded to the Unibody and gave me his MBP so that I can give it to my wife. So now, I have 2 of the same exact MBP's.
So the problem that I'm having is that when I did a Erase and Install on the MBP that was given to me, it didn't have the same amount of HD space as the one I originally had. I only know this, because I recently did an Erase and Install on my original MBP and because I wanted a fresh MBP. When I did the Erase and Install on my original MBP, I noticed that it had about 174GB of HD space left.
Now with the MBP that I just received, I did the same exact Erase and Install to my new MBP and it only has 171.71GB of HD space.
Also, I notice after doing the Erase and Install again on the new MBP. I noticed that when I did the Customize portion it stated that I am going to be need 9.2GB of available space and that I have 185GB of available space. So after I did the Erase and Install, shouldn't it have about 174GB of space like my original MBP. And that's why I know my new MBP is missing HD space.
So my question is that, why am I missing HD space on my new MBP after Erase and Install and what can I do to get it right. Why wouldn't have the two computers have the same specs after Erase and Install has been done exactly the same way? (The only reason I did the Erase and Install on the new MBP is so that I can configure it for my wife with her login and info.)
Sorry for the long read... but here are the cliff notes.
1. I have 2 MBP that are exactly the same.
2. I did an Erase and Install on both MBP.
3. After Erase and Install, one of them has about 3GB less HD space.
If anyone can help me, please let me know. I will post replies here as well.
Otherwise, I will be taking it back to Apple since it's still under warranty.
Thanks

But my problem is right after the same exact Erase and Install on both, they have different free space.
How could you possibly know this without using the drives? IOW, how & when are you checking the drives' capacity & the used & available space of each?
Again, I've noticed that the HD space specifies that it has 185.99GB of available space after the OS, but once you add certain things, it specifies that it will be using 9.2GB of the available 185.99GB.
What do you mean by "185.99GB of available space after the OS"? What are the "certain things" & what is the "it" that specifies 9.2GB will be used?
If you really mean each drive is showing a *total capacity* of 185.99 GB (before or after installing anything), this is right for a "200 GB" drive. That is because the drive capacity specification is given in decimal based gigabytes but the computer reports capacity in binary based ones. (See paragraph 3 in my post at http://discussions.apple.com/thread.jspa?messageID=9389432&#9389432 or search this forum for the word "gibibyte" for more about that.) This number should not change when something is installed -- it is the total capacity of the drive.
If the "certain thing" that says 9.2 GB (or whatever) is the installer application, be advised that it is telling you +the free space needed for the installation+, which is not that same thing as +the space used by the installed files+ once the process is complete. This is because the installer requires temporary file space to assemble the files it will install, hold the results of pre- & post- installation checks, & so on. This temporary space is eventually freed up once the files are in place. In part because of this, the reported space needed is only an estimate, & is always more than the space used by the installed files. (IOW, if it says 9.2 GB are needed for the installation, you should always see less than this used by the sum of all the files installed.)
Thus, as I have already explained as best as I know how, you need to look not just at the free space of each drive but at the total capacity, the number of files & folders used on each volume, & the partition map if you want to make a meaningful comparison of the two drives. I have already explained how to do this using Disk Utility. If you are not willing to do that but instead rely on what appear to be flawed inferences from other things, I can't help you any more than I already have.

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    Message was edited by: Nathan Barton

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