Reddit mentions of Seagate 4TB Laptop HDD SATA 6Gb/s 128MB Cache 2.5-Inch Internal Hard Drive (ST4000LM016)

https://www.amazon.com/Seagate-Laptop-2-5-Inch-Internal-ST4000LM016/dp/B01C4VZO7G

Why does it have to be WD Red?

You can get 2.5" 4TB drives for 130USD

https://www.amazon.com/dp/B01C4VZO7G/?tag=pcpapi-20

This is probably your best option if you need a lot of space in a 2,5" drive..

What about a 2 or 4 TB laptop HDD? Would that fit?

Like this one https://www.amazon.com/Seagate-Laptop-2-5-Inch-Internal-ST4000LM016/dp/B01C4VZO7G

I got a lightly used Seagate 4TB Laptop 2.5" SATA 6Gb/s 128MB Cache Hard Drive. Link. It works flawlessly with no errors. The is a 2.5" Laptop Drive but please be aware that if you are thinking about installing it in enclosures or PS3/4/Xbox it will NOT fit as this has a depth of 15mm rather than the normal 9.5mm or SSD's 7mm.
Only $70 Shipped. Timestamp

many thanks! would this also work? https://www.amazon.com/dp/B01C4VZO7G/ref=twister_B01CL4D2FM?_encoding=UTF8&psc=1

edit: corrected the link

There is a bigger issue than that with buying games digitally with the Xbox One and PS4.

I have a PS4, almost every "AAA" game requires a 30 GB+ hard drive install. Not only does it take fucking forever to download these massive updates (Destiny had an 80 GB update download), the PS4 ships with a 500 GB hard drive. Do the math and you'll see that you can fit, at best, less than 20 games on that drive.

Sure I can upgrade the hard drive, but a 4 TB 2.5" HDD is fairly expensive and that just ups the limit.

Yeah they do

Seagate 4TB Laptop HDD SATA 6Gb/s 128MB Cache 2.5-Inch Internal Hard Drive (ST4000LM016) https://www.amazon.com/dp/B01C4VZO7G/ref=cm_sw_r_cp_apa_.x1XBb4XKBMD3