Question about Seagate Expansion Portable

I have already bought the 4TB Expansion Drive 5 times. All of them are equipped with SATA. The disks work well as SATA in a tower PC. I can recommend them for backup but not for every day use. I built a small tower with these drives (5x4TB) for cold backup. I switch it on, make the backup and switch it off again and disconnect it from the power.

I've had my hands on two different versions of the 5TB variant so far, and they both had a standard SATA interface internally. I therefore strongly assume that this is also the case with the 4TB version.

Yes they have. I use 8 of these and older HDDs as a zfs raid. As long as you don't use it excessively (like a laptop, 12h spinup/day, low-medium IO) it works great.