The 2011 tsunami affected hard drive production. At that time, you were lucky to even find a reasonably priced internal hard drive. External hard drives became the priority and we began shucking them. I don't think that has changed since. You would think an internal bare drive, requiring less parts because there is no enclosure, USB bridge, included cables, power supply and increased assembly labor, would be less expensive... but it isn't. External drives were then and are now less expensive afaik
. Perhaps because HTPC's were deemed out of fashion in exchange for streaming content and occasional attached storage for streaming devices which cannot accommodate additional internal HDD storage.
Through the years I've bought new external drives and shucked them as my collection grows. I take the newer larger drives and mount them local inside my Silverstone HTPC. I've modded it to comfortably mount (11) 3.5". The older smaller drives I retire to backplane enclosures for direct 1:1 backup. I can't afford monetarily, drive letter, or physical mounting a parity drive so 1:1 has always worked best for me. They hold 18 backup drives. This 18 total equals the size of the 11 local drives.
Now that UHD rips require twice the size of HD rips (given you opt for the highest quality rips common around 80GB per title and some multi disc titles such as Blue Planet II (2017) at 150GB or GOT Season 1 at 350GB) even a 12TB HDD fills quickly when you are an avid enthusiast.
Until 12TB HDD's come way down in price, I'll need to work with what I have, a conglomeration of 8TB to 500GB drives. Of the 29 drives in use, the spare room I have for local and backup will exhaust in about 15 more rips or so. Luckily, I have other spare shelved HDD's that are 1TB and 2TB retired long ago. Recently I shucked them back into enclosures having saved them for a total of 8 giving me another 12TB to work with. Swapping drives around gives me an additional 6TB local and another 6TB for backup. My drives are a range of Toshiba, WD, Seagate, etc. 2.5" and 3.5". Most of the external enclosures are Seagate. Even 2.5" Toshiba laptop drives were placed in Seagate 3.5" enclosures with no problems.
I stacked the enclosures one on top of another next to the backplanes since all of these new external USB's are backup only. I have a lot of 3.0 USB ports and plugged in each one rather than a USB port multiplier. I plugged all the power supplies into common 6 plug surge protectors daisy chaining them because the power supplies are large and only accommodate 3 on each. It's what I had laying around not wanting to purchase anything better. I then plugged in the last of the daisy chained surge protectors into a X-10 appliance module and plugged it into the wall so I can control it on/off as I do the other 3 backplanes. This allows my 26 backup drives to easily power up and down with the flip of a switch. I quickly found out surge protectors don't like to be daisy chained taking an off/on mind of its own. I put a nightlight bulb in one of the plugs to cure it. I should add I also dynamically joined the 8 new external drives together because drive letters are exhausted as are some of the backplane backup other drives. I can easily add another drive in the future. If a drive fails, I lose all data on that drive letter but I don't mind.
I write this to encourage you to save your shucked enclosures even though you think you'll never need them. Also, WD is not the only game in town nor are red/white drives. Most of my drives are Seagate greens. I've never had a failure except for a handful of 3TB's a decade ago. That problem was resolved once 5TB hit the scene. Fwiw, 350GB UHD HDR iso titles via USB 2.0 or 3.0 play butter smooth for those that blame poor bandwidth of less expensive green external drives for their failures. My Toshiba 2.5" 500GB 2 decade old laptop drive in a 3.5" 5TB Seagate enclosure plays perfectly in a USB 2.0 port fwiw.