A Universal Serial Bus (USB) device is an external magnetic hard drive that is primarily used for basic data transfer into your computer system. To start a USB device enumeration process, you firstly need to connect the USB device to USB host. If the host supports the USB device, then the device drivers required for communicating with the device are loaded and you can start the data transfer process. However, improper or surprise removal of USB device - when data transfer is in progress - can sometimes leave your Windows operating system in unresponsive state (unbootable state). In such situations, the data stored on your Windows based hard drive becomes inaccessible. To access your data under such scenarios, an ideal way is to restore your data from an updated backup. But if in case, no backup is available or backup falls short to restore the required data, then you will need to opt for advanced data recovery application that can recover your inaccessible data.

To illustrate this, consider a scenario where you attached a USB device to transfer some data to your Windows Vista based computer. While the transferring process was in progress, you accidentally removed the USB device. Next, when you attempt the operating the operating system (Windows Vista) into S3 sleep (standby mode), your operating system stops responding. Furthermore, the operating system does not boot even you restart your system - making the data saved in your hard drive inaccessible.

Cause:

The above problem mainly occurs when the USB device is implemented by a Kernel-Mode Framework driver which reads data from a bulk endpoint on the USB device.

Resolution:

To resolve the above problem and access your hard drive data, you will need to set the "NumPendingReads" member to "1" in the Kernel-Mode Driver Framework driver code if you configure a continuous reader for a USB device.

However, if the above resolution fails then you will need to reinstall Windows Vista operating system. A clean reinstall of Windows Vista results in complete loss of data saved in hard drive partition. To recover your data after re-installation, you will need to use effective partition recovery software. Such data recovery tools use advanced scanning procedures to recover your lost data. These data recovery tools are built with highly graphical user interface which makes them easy to understand to both home users and IT professionals.

Stellar Phoenix Windows Data Recovery is an advanced data recovery tool that recovers lost data from FAT32, VFAT, NTFS, and NTFS5 based hard drive partitions. The tool recovers 185 varied file types and supports Windows 7 RC1, Vista, XP, 2003, and 2000.