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Since this moring my Seagate 500GB external hard drive P/N 9NK2AL-510 is displaying i/o device error. I am unable to access any files stored on it. Please advise.
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There exist commercial "data recovery" services that can try to repair your device, just long-enough to rescue and copy your files. For example, see: https://services.seagate.com/index.aspx?lng=en-US for a "no data - no charge" guarantee.
Purchase a new "empty" enclosure, and "transplant" the disk-drive from inside your enclosure into the new enclosure. Cost will be $30 to $40, but all your files on your disk-drive will be accessible.
The disk-drive inside the enclosure is "dying".
If the warranty still is valid, exercise the warranty to get it replaced, at minimal cost to you.
If the warranty has expired, open the enclosure, remove the disk-drive, and take the disk-drive to a computer-store. Buy a new, compatible, drive, and then "transplant" it into the enclosure, to "revive" your external file-storage appliance.
What happens when you try to connect the device? Any error-messages?
What does not happen?
If you connect it to the Windows XP system, can you still see the files?
This always depends upon how valuable the data is.
fixmbr in the recovery console will not harm the drive IF you can get into it by way of the USB interface. You might consider removing the hard drive and putting into a desktop , directly connected to the SATA IDE controller to eliminate the eSATA USB interface as the cause of the problem.
Run chkdsk /r as soon as you find a way to get access.
Use command line options that you know what they do, but I would tread lightly since more damage can be caused.
There's not much troubelshooting you can do with a failed external disk. power off PC and hd and then disconnect all cables, wait 30 secs, power the PC on, let it boot to the OS, power the hard drive on and then connect. If the drive shows up but you still cannot access it or get weird property readings, it generally means the hd controller has failed. If the data's worth more than $1000, you can take it to a data recovery group like Ontrak or Cherry Systems, but otherwise, just get a new hd and restore whatever backups you have.
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