How to recover data from an external hard drive that has lost half of the data I was storing in it

I am using a Lacie external hard drive to store my photos on. Every once in awhile it disappears from my screen. I have been able to bring it back by unplugging and re-plugging from the computer. Then I had to turn it off and on again. Finally, it lost about half the stored photos, and I couldn't recover them. Does anybody have any suggestions as to what I might do to fix this problem?
I'm using an iMac with iOS 10.6.8
The hard drive has 1 TB capacity

You can try these.
Data Recovery Programs
Data Recovery – Best
Data Recovery – Disk Drill
Data Recovery – Data Rescue
Data Recovery – File Salvage
Data Recovery – Stellar Phoenix
Data Recovery - uFlysoft

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Message was edited by: dudebob

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How to recover data from an external hard drive that has lost half of the data I was storing in it

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