Seagate Barracuda drive beeping (worry or don't worry)

As I was getting ready to move my setup to an SSD/HDD system, I got a new seagate barracuda 2 TB HDD (Model # ST2000DM008) from ebay (new, not open box used/seller refurbished, new), was slightly amazed at how small it was compated to my older ST2000DM006 model, but that's another day

lately, I've been hearing some weird beeping coming from it (not from my optical drive, tested this while the optical drive was disconnected), so because of this, I ran a chkdsk /scan on the D: drive, it came back with no errors whatsoever, so I booted up my minitool partition wizard and ran its surface test mode on the seagate drive, it all came back green, no bad blocks at all; downloaded the SeaTools utility, ran a S.M.A.R.T. test, came back green, short generic test, came back green, long generic test, came back green, I don't know what this beeping is to my system, but its making me worried just a bit

Zippyshare Link

Is this nothing to worry about, or otherwise?

I only used zippylink as I can't upload that big of an mp4 to here at all, its fine; if you want me to re-upload the mp4 to a different host, which one would you like me to use?

as for that youtube link, slap the cover on the drive, make the sound a bit lighter, and that is as close to the sound im hearing

to my knowledge, this hasnt happened with my old HDD only setup at all, yes im sure the mounting screws are as tight as I can get them (using the 2.5" to 3.5" ssd bracket barely left me with leeway in maneuvering the bigger hard drive bracket back into place). To the best of my knowledge (and at the time of this post), it happens rarely and doesn't last long. It....frankly I don't know if it does/doesn't correlate with disk activity, as I stated before, I got the samsund 860 evo ssd and the seagate barracuda HDD all new on ebay (mainly because I wanted to save some money buying it new from newegg or amazon, prices approached triple digits)

right now, its working fine, just puzzled on the beeping is all

on top of the samsung magician program keeping watch over my SSD, I got the piriform program speccy as one of my S.M.A.R.T. checkers, defraggler as a secondary smart checker (although it lists my barracuda drive as another SSD instead of an HDD for some reason; also the drive did that weird beep noise once just now at the time of this post), and the SeaTools program for more of an in-depth check on my D: drive

all in all, if it starts approaching a bad state, ill just one to one clone it to a different drive; off chance I will need to replace it, I was browsing the userbench website checking its HDD rankings, and they say the WD Gold HDD is the 1st in speed rankings; last WD drive I bought was a caviar black and wow it was loud. Is the WD Gold drive any louder than the average consumer hard drives like the barracuda or other non-server HDDs out there?

- - - Updated - - -

alright, so besides the big metal HDD bracket my barracuda drive was in, my computer can hold 3 SSDs (laptop version depending if I get 2.5" to 3.5" brackets for them) or 3 HDDs. 2 of the HDDs can reside in the big metal bracket that my old hard drives used to be in, or a small horizontal section which lies under where the optical drives would go in my xps 8700

I moved my barracuda there and re-positioned the SATA cable attached to it to compensate, and ever since then the frequency of the beeps have sharply decreased to just one every....average of 5 hours or so. The frequency of the beeps is very less than what it was before, but I still get the one beep every now and then; maybe it was the sata cables being positioned wrong that did it, either way, the beeping isnt totally solved per say, but it is mitigated somewhat