My external HD of 1TB is not being recognized by the iMac and when after a long waiting period it does, the whole computer becomes extremely slow. Do I need any particular add-on to make it workable?

My external HD of 1TB is not being recognized by the iMac and when after a long waiting period it does, the whole computer becomes extremely slow. Do I need any particular add-on to make it workable?
Before I updated to OS X Mavericks I was using another external disk that was getting disconnected ocasionally so I bought a new ADATA HD710 portable 1TB Drive and moved the files to it. This new drive which is supposed to be OS X Mavericks compatible takes minutes to show the files especially when opening second and third level folders which has made mu iMac unusable
What should I do?

Your Mac should be able to recognize many different types of drives (including Windows-formatted drives) immediately for Reading, provided they are in good working condition and not damaged. There should be no need to transfer to a different type of drive.
If there is no recognition of this drive, see if it can be seen in Disk Utility.
If your aim is to transfer the data on it DO NOT use ERASE or PARTITION as these will completely erase all the information on the Drive.
If the drive is present while the Mac sleeps, it is likely to drop out and not be seen any longer, especially if it is a USB-powered drive.

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