What is the uppercase file?

Question

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

Solution

It stores a mapping between lower-case letters and upper-case letters (so as to provide case-insensitivity). Details here: http://www.siao2.com/2005/01/16/353873.aspx

And this one may apply more specifically to you: http://www.siao2.com/2007/12/27/6875879.aspx, 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”

Comments

[mwfearnley]

For searchability: I got these error lines: Read-only chkdsk found bad on-disk uppercase table - using system table. / Errors detected in the uppercase file. (without /f), and Correcting errors in the uppercase file. (with /f)

[Rhys]

Perfect :) I figured it was something like that, but it's nice to quench my curiosity.