Frequent hard drive access question

I worte a control with a hexeditor-like display that read a file from the hard disk, but the way I have it set up now it has to re-read the information it's displaying from the hard disk each time it gets redrawn. Now I imagine if the data really does get re-read each time it would put uneccessary strain on the drive, but does windows keep the data cached in memory for a short time so it won't have to access the HD uneccessarily? If it does then I won't have to rewrite that portion of the code :D.

There is some level of caching in modern filesystems.
Profile the code. If it doesn't perform as well as you would like, then rewrite it.

Or rewrite it better, just for the love writting code.

gg

Well, it preforms just fine speed wise. I'd rather not rewrite this particular piece of code because I've been working on this control to long as it is, and besides, if it ain't broke then don't fix it ;).