Furthermore, the I/O manager gives drivers the choice of implementing a shortcut I/O interface that can often mitigate IRP allocation for I/O processing. Types of I/OĪpplications have several options for the I/O requests they issue. Processing varies further depending on whether the caller specified synchronous or asynchronous I/O, so we’ll begin our discussion of I/O types with these two and then move on to others. The stages vary depending on whether the request is destined for a device operated by a single-layered driver or for a device reached through a multilayered driver. I/O requests pass through several predictable stages of processing. If the file is removed or corrupted, read this article to restore its original version from Windows 7 installation media.Now that we’ve covered the structure and types of drivers and the data structures that support them, let’s look at how I/O requests flow through the system. The USBSTOR service is using the USBSTOR.SYS file that is located in the C:\Windows\system32\DRIVERS directory. Close the command window and restart the computer. Copy the command below, paste it into the command window and press ENTER:ģ. Run the Command Prompt as an administrator.Ģ. Restore Default Startup Configuration of USB Mass Storage Driverġ. Then Windows 7 startup should proceed and the user should be notified that the USBSTOR service is not running because of the error. If USB Mass Storage Driver fails to start, Windows 7 attempts to write the failure details into Event Log. In Windows 7 it won't be started if the user doesn't start it. USB Mass Storage Driver is a kernel device driver. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR %SystemRoot%\system32\DRIVERS\USBSTOR.SYS USB Mass Storage Class Driver by Microsoft Corporation. USB Mass Storage Driver (USBSTOR) Service Defaults in Windows 7
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