Hello, Actually you don't not need the low level format tool to convert your drive to NTFS. You should be able to do that through the computer itself... Hello, Please note that for files larger than 4GB, you’ll need to convert the files to NTFS. We'll be glad to assist you in formatting your drive to NTFS. Please try the following steps: First - Open My Computer Right click on the SDHC drive Select Properties Select the Hardware Tab Select the USB device Click the Properties button Select Policies Select Optimize for Performance Click OK Second - Right click on the Drive Select Format Select the NTFS format option Please let me know if it does not resolve your issue. Thank You for choosing Patriot Memory. Regards, Ben