Welcome to Tom's Hardware, @Ashutosh_9!
Can you please provide more details about your issues and the drives that it concerns? You mentioned that you are facing issues with the transfer speed to the SSD, but where are you transferring these files from?
I'd recommend you test both the SSD and the other drive that using their brand-specific diagnostic utilities. I'd also suggest you swap the cables and the ports where the drives are connected to.
Here are some useful links to discussions with third-party diagnostic tools you can use to perform further troubleshooting.
Hope it helps. Keep me posted with the details and make sure you backup all your data somewhere off-site before proceeding with the troubleshooting!
SuperSoph_WD