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. FAT Recovery program- Restorer One more efficient program to recover the hard drive of FAT file system is Restorer 2000 which can get back your missing data as well as cleanse your drive if it is corrupted or any error has occurred to it because of formatting. User reviews say that Restorer is the best powerful undelete and worthy software solution in the market, by which you can recover the data lost. Apart from it, the data amount that has to be retrieved along with the steps needed and price of the service will be given .Thus these firms deliver some quotations to do the hard drive recovery. Just after the evaluation along with estimation done, the next step is approval to continue with the actual data recovery of external drive. The IBM recovery software utilize the wise technology that is involved in all modern hard disks, which enables the hard drive recovery to evaluate and calculate the time-span that your hard drive will end in Threshold Exceeded Condition (TEC).the IBM software tool can be made alive to execute the TEC model on the chosen drive. Though we have knowledge of all these, it is quite significant that only marketers and makers who are authorized to it shall in the laptop for recovery of hard drive. The units of laptop are hypersensitive to the dust and moisture, so any trial to open the laptop shall be made only inn the room which is specially made and authorized for it, as it needs to be clean. So we can say that, free download of software won't meet the needs for data recovery. They are just provided to understand you that a remedy for data recovery problems is always there to help you retrieve the data and drives recovery. Most of the providers who deliver software for free will also have fixed span of period, after which the software will go off just like the hard drive break down.