Does re-installing system slow down the HD?

Hi
My MBP came back from repair with a new HD and OS 10.5 already installed. For various reasons I might want to wipe it and re-install the system software. But does this process of re-installing the system leave any 'debris' on the drive which might slow down performance in the long run? If so I may leave it, but it's a question I've always wondered about - when you re-install does the drive go back to being 'like new' again or is there a gradual accumulation of code which just adds more clutter?
Thanks for any help
John

If the OS or an app or whatever needs 10GB (for example) of free space, what does it matter if it's 10GB out of 100GB or 10GB out of 1TB?
I don't think it matters.
I thought that's what MacRS4 is saying
I did not understand it to be. The assertion was:
The 85% corruption thing fassumes a relationship of the largest file types to the size of the physical drive.
It does not. It assumes that the directory expansion varies with the total amount of data that needs to be stored. The 85% refers to the smallest amount of contiguous disk capacity needed to permit the file system to lay down new pieces of the Extents Overflow file. That does not have to do with the size of any individual file but with the total amount of data that needs to be accommodated in the file system/directory.
this question seems to asd for just the opposite, a rationale as to why a percentage would be needed, not a set amount of space.
My intention was to suggest there was a relationship (read percentage) between the total amount of data on the drive and the size of the filesystem. On a 100 GB HDD the filesystem will be smaller as the amount of data stored occupies a smaller amount of disk capacity. On a 1 Terabyte HDD 85% of total used capacity requires a corresponding size of directory. As I understand it the size of the directory varies in direct relationship with the amount of data stored on the drive and not to the total capacity of the HDD. The Micromat study (sorry, I have lost the link for that reference) found that the optimal capacity was 85% to avoid directory corruption.
As I noted in earlier posts, the equation may have changed with the advent of larger capacity drives, but I am not aware of documentation to that effect. I should also add that I am not by any means an expert. However, I am not willing to test to see how crowded my HDD has to be before I encounter an unrecoverable directory.
My asking for support for statements made is not by way of debate. I earnestly seek to learn more about this and other subjects from those who have information I do not, myself, have.
cornelius

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