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Hello first I just bought a laptop of HP CN view and I attacked my external hard drive from Maxtor 500GB but I do not open the file tells me that I do not have permits and that the files are deleted ... So I added permissions and I used it on the computer and the files are there ... I do not know how to help please ....
There are 3 main possibilities from which you can recover your hard disk and its stored data:
1st is that the logical structure of the drive is damaged. The good news is that this can often be fixed with software, and although some files may be lost, there is a good chance of recovering most of them.
2nd is that the enclosure (powersupply or bridge board) has failed. In that case you are in luck because if you remove the drive mechanism from the case, and put it in a different case, it will work.
(this will however void the manufacturer's warranty)
3rd is that the drive mechanism itself has failed. In that case you may be up a creek. If the motor isn't spinning the drive, or if the drive's controller board has burned out, then nothing short of repair by an expert is going to help. Data recovery firms will fix it, but for a fee of $400 - $ several thousand.
If your problem is logical (#1)
-- that is the drive spins properly and shows up on the USB bus but there are no accessible partitions or data --
then you may be able to recover data from it, or repair the logical damage. Programs like SpinRite from GRC labs and Ontrack utilities might repair the damage, programs like DataRescue PC, Pandora and others might recover data even if the directories and file structure are damaged.