25, 2009, our inventory reserve was $86.9 million. As a percentage of our gross inventory balance, our inventory reserve has ranged between 7.8% and 13.9% during fiscal years 2009 and 2008. As of January 25, 2009, our inventory reserve represented the high end of this range at 13.9% of our gross inventory balance.



     Warranty Liabilities



    Cost of revenue includes the estimated cost of product warranties that are calculated at the point of revenue recognition. Under limited circumstances, we may offer an extended limited warranty to customers for certain products.  Our products are complex and may contain defects or experience failures due to any number of issues in design, fabrication, packaging, materials and/or use within a system. If any of our products or technologies contains a defect, compatibility issue or other error, we may have to invest additional research and development efforts to find and correct the issue.  Such efforts could divert our management’s and engineers’ attention from the development of new products and technologies and could increase our operating costs and reduce our gross margin. In addition, an error or defect in new products or releases or related software drivers after commencement of commercial shipments could result in failure to achieve market acceptance or loss of design wins. Also, we may be required to reimburse customers, including our customers’ costs to repair or replace products in the field. A product recall or a significant number of product returns could be expensive, damage our reputation and could result in the shifting of business to our competitors. Costs associated with correcting defects, errors, bugs or other issues could be significant and could materially harm our financial results.



    In July 2008, we recorded a $196.0 million charge against cost of revenue to cover anticipated customer warranty, repair, return, replacement and other associated costs arising from a weak die/packaging material set in certain versions of our previous generation MCP and GPU products used in notebook systems. The MCP and GPU products that are impacted were included in a number of notebook products that were shipped and sold in significant quantities. Certain notebook configurations of these MCP and GPU products are failing in the field at higher than normal rates. While we have not been able to determine a root cause for these failures, testing suggests a weak material set of die/package combination, system thermal management designs, and customer use patterns are contributing factors. We intend to fully support our customers in their repair and replacement of these impacted MCP and GPU products that fail, and their other efforts to mitigate the consequences of these failures. We continue to not see any abnormal failure rates in any systems using NVIDIA products other than certain notebook configurations. However, we are continuing to test and otherwise investigate other products. There can be no assurance that we will not discover defects in other MCP or GPU products.



    Determining the amount of the $196.0 million charge related to this issue required management to make estimates and