Seagate Expansion 20TB External USB Hard Drive arrived in retail box, 1-Year Warranty. The power adapter included several changeable international power plug types. MicroUSB 3.0 cable plug. Fairly quiet, but does make a chugging sound. Runs hot 55C in the enclosure. Drive inside is a Seagate BarraCuda ST20000DM001-3Y3103, Made in Thailand. Actual capacity 18.19 TB free space (20,000,586,850,304 bytes). Fast speeds, Sequential 246 MB/s, 239 MB/s R/W, 7200 rpm. About the same performance as an IronWolf Pro. Ran a full surface scan, 30+ hours. No issues, works fine. Good enough for simple NAS storage.

It's a great value, especially if you can catch it on sale. Performance is good for a hard drive. It does run rather hot, over 50C, and makes disconcertingly loud clicking and clunking noises, especially when it starts up. I'm assuming this is normal for this drive model and that nothing is wrong with it until proven otherwise.

Bought two, shucked them, no pin mod needed. They're working great in my synology nas. I stress tested them both, did a secure erase followed by a full smart test and both worked fine. Opening up the enclosure was a bit of a mess. There are plastic clips on each side, in the center. Google says these might be HAMR drives, which is newer HD tech that Seagate uses and their long term reliability is kinda unknown. Time will tell. No issues with temps, they run cooler than my WD Red Plus.

20tb is alot but out the box it was at like 18.6 tb free and i tried to reformat it, thinking it would jump up to 20tb but it didnt so idk why they market it as 20tb its very loud and vibrates it could be that its 20tb and is big so its just alot more aggressive or its faulty and ill have to return doing research its supposedly normal for this size idk it isnt slow or anything so ill see but besides the tb not being at a full 20 or heck even 19tb is crazy but so far its being very useful and im only writing any of this cuz theres no reviews im sure not alot of people are in the market for 20tb haha i also bought there 14tb version which has none of the loudness mentioned above but it dis also out the box come in at 12.somthing TB

Nice sturdy external HDD, functions like it should. No issue so far.