Hard Disk Monitoring

Greetings, I have a problem with Seagate 1TB 2.5 inch hard drive, every time when i start copying data on to this drive he starts with transfer speed about 100MB/s but suddenly from 100MB/s slows down 355KB/s and weak sectors showing up. Is there any way to fix the hard drive to function normaly? Th...

I've had a 2TB Seagate in my system show as 14% healthy for the last few days, so I put in an RMA and started moving all my files off it. I logged in today, and 10 minutes ago, I noticed that HDD Sentinel was giving it a score of 100% health. What gives? I'm so confused.