Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I ran a chkdsk and it stated it was correcting the upercase file. Out of complete curiosity I Googled it but couldn't find any info. Anyone know what this file is?

share|improve this question
up vote 5 down vote accepted

It stores a mapping between lower-case letters and upper-case letters (so as to provide case-insensitivity). Details here:

And this one may apply more specifically to you:, and links to this MSKB article: Error message when you run Chkdsk.exe on a Windows XP-based or on a Windows Server 2003-based computer: “Correcting errors in the uppercase file”

share|improve this answer
Perfect :) I figured it was something like that, but it's nice to quench my curiosity. – Jeff F. Mar 21 '11 at 17:45

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .