The access to the file can be denied due to number of reasons. It may be human intervention which is purposeful, any dysfunction of it electronically or mechanically, occurrence of the problem in the software, virus or worm attack etc. But whatever it may be ,the best thing to note down is that most of the time the data shall be recovered within maximum of two days and it is 80-90% assured that the lost data ca be regained by any expert who is well versed in doing this type of procedure. Data recovery of external drives like USB A number of methods that are available to store the data n the hard drive for safety like removable disks, CD, DVD etc are some of them. Whatever be the storage device any media is subject to risks and any mechanical and electrical error may occur anytime. However old or new the device, it may fail to operate properly and you cannot do anything to stop it. If that is the case, then the hard drive is gong to get crashed or maybe any problem is affecting the software very heavily. If, by any chance you are having KSM hard drive as your drive named Deskstar, then the IBM hard drives are not different from any other hard drive. They are also another normal hard drive which will get damaged and suffer from all issues for a normal hard drive. Evaluating the Best Hard Drive Recovery Software Whenever you turned your computer on, you would have found out that the virus attack has removed most of your files and they all have got corrupted. Even sometimes you may delete an email or an important file which you would like to recover late from the recycle bin as you need the information to proceed further. This software will try to get connected to the server which can be called recovery server and hires AI (artificial Intelligence).This AI can be compared with your script to the prior recovery of data sessions. This new version software will work with several file system like NTFS, FAT 16, FAT 32, FAT 12 etc and this recovery software can even find out the data that have gone from the Zip disk, Jaz Disks, digital camera, Rar disk etc apart from the hard drive of PC. After doing a thorough check like this and answering the questions your self, you can call an expert to do the service .Its very important to choose the right organization which is reputed, if you want to approach a firm which does the service. In today's world where lot of firms proving service, it will be a very difficult work for you to choose the company you want.