August 30th, 2016

What is the NTDiskQuotaSidCache.ndx file for?

Raymond Chen
Raymond Chen

A customer was looking for information about the file %LOCAL­APP­DATA%\Microsoft\Windows NT\Disk­Quota\NT­Disk­Quota­Sid­Cache.ndx. All they could find is this KB article.

The NT­Disk­Quota­Sid­Cache.ndx file is used by the Disk Quota control panel. It’s a cache of SIDs and names, to improve performance of mapping SIDs to display names. You can delete it, and it will be regenerated the next time you run the Disk Quota control panel.

The customer never explained what they needed the information for, but they did thank us. (Or at least their liaison thanked us on the customer’s behalf.)

Category
Old New Thing
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Tips/Support

Author

Raymond Chen

Raymond has been involved in the evolution of Windows for more than 30 years. In 2003, he began a Web site known as The Old New Thing which has grown in popularity far beyond his wildest imagination, a development which still gives him the heebie-jeebies. The Web site spawned a book, coincidentally also titled The Old New Thing (Addison Wesley 2007). He occasionally appears on the Windows Dev Docs Twitter account to tell stories which convey no useful information.

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