Just got a new Seagate 4TB Drive (ST4000DM004) as my main data drive. OS runs on my exclusive OS drive which is a Samsung SSD. Now this new drive has been plugged into the SATA3 port of my motherboard. I initialized and then partitioned using GPT (3 equal partitions). 1. Firstly i ran Crystal Disk Mark on the empty partitions. Only 2 times or so i heard the drive beep for a second. I know HDDS cant beep so it must be a head screech ? It was very short (about 1 second) so sounded like a beep. After the beep sound the entire disk vanished. A reboot brought it back. This happened twice. Then i pulled out the old cable and switched for a new one. After the cable switch i ran the same Crystal Disk Mark tests several times and the beep/screech has never come back neither has the disk dropped out requiring a reboot to see it. 2. Secondly the Crystal Disk Mark test shows seq read and write to have a gradual fall off on each partition in order of creation. The test shows 190 MB/s read & 185 MB/s write for the first partition. 171 MB/s read & 168 MB/s write on the 2nd partition. And 152 MB/s read & 149 MB/s write on the 3rd partition. Is this normal ? To have a gentle fall off in read/write speeds for each partition. Given these 2 above factors is my disk basically ok or is it better to return it for a replacement ?