External hard drive problem

I have a 500gb portable USB hard drive which until last week was running fine and had about 450gb worth of data on it. A couPle of times I had problems with the USB connection on the drive not quite connecting when it was moved so therefore on numerous occasions I had to unplug the drive and recconect which overtime I am assuming has caused issues. So eventually the drive became unrecognisable in windows explorer so I ran chkdsk and it found a few errors and fixed them. Now the drive shows up in win explorer but only shows 30gb of data which I am unable to access when I double click to open the drive windows doesn't show any data at all. I opened the drive in disk management utility and it shows 450gb full which was on it. I have tried data recovery programme and have recovered the 35gb of data shown in windows explorer. Can I recover the test of my data? My O/S is Windows 7
Thanks
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More about external hard drive problem
  1. Take apart the harddrive and plug the drive straight into a desk top. I've seen a lot of external harddrive enclosures fail, but it might just be a bad drive. Worth a try though
  2. Thanks bavman. Have already done that. Made no difference.
  3. Try different recovery program. Here is a good list in
    http://www.hiren.info/pages/bootcd
    under "Recovery Tools"

    Or may need to go to the professional.
  4. Thanks. That's a great list of useful tools. Are they all free and what would be the best recovery tool?
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