Pros: Inexpensive for the capacity and speed. SMART data says not many power cycle counts. But, keep reading...

Cons: High hours (~33,000), so close to four years of use. Not a big deal provided everything else is ok, which so far it is.... maybe. Keep reading.... Definitely out of *factory* warranty given power-on hours, so your recourse is with the seller (their "3 year warranty" is with them; HGST is going to ignore you after a serial number check.) Has a GPT PARTITION TABLE AND DATA on it! It came out of a Windows system :-) No, I won't try to go through the data and an encrypted filesystem is going on it, but that's something to think about..... it was NOT wiped (not even the GPT partition table!) before shipment. SMART data *does* show unrecoverable errors some 10,000hrs in the past and the last extended test was aborted (in other words whoever "refurbished" this didn't run a full, long-length SMART self-test -- that typically takes 12+ hours to complete.) We'll see if I'm happy once I run this thing for a while..... exactly what "refurbished" means may be open to some debate here. I think I'd more-accurately call these disks "used" than "refurbished", but if they're operationally solid then that's fine. Let's just call things what they are, and in addition how about both an extended SMART self-test that passes *and* a wiped partition table (if not a secure erase) before they're shipped?

Overall Review: You can't update reviews here, so once posted, it's posted. Hopefully I don't wind up with a both a problem and a fight with the Marketplace seller -- we shall see.

Pros: Without this card you're only getting half of what your ARECA adapter can provide in terms of performance -- if that. This unit is not optional if you actually want the performance you paid for. While you CAN force writeback caching on the adapter without this installed, DON'T -- if the power goes off you will get silent data corruption. Therefore this is a must-have accessory.

Cons: It's utterly scandalous that there's no $20 (or even $40) battery-only replacement option, given that the battery is a plug-in. C'mon guys, over $100 for a replacement $5 lithium battery? I think not. But never fear, provided you can find a replacement with the requisite three wires (including sense), it fits, and you can solder it's replaceable. I've done it and it works. Yeah, perhaps "not recommended", but anyone who thinks I'm forking up over $100 for a $5 battery has rocks in their head. Change 'em out every couple of years so you know the capacity is good.

Overall Review: There's just no argument available for NOT buying one of these if you have an Areca adapter. The performance differences on writes are immense and there is no way around this purchase if you actually want the adapter to provide the performance you paid for. This really ought not be an optional accessory, but it is what it is.

Cons: The "pigtail" converter included in the box for the newer high-density power input cord may not work with your existing power supply, even though on paper it should. Be prepared for that possibility; I ran into this personally. Fortunately I had a Corsair power supply with the newer output and cable on my "spares" shelf. If you're coming from something higher in the Nvidia line than a 3060 or anything in the 4xxx series you might be underwhelmed with the improvement.

Overall Review: I'm not a gamer -- my use is video rendering (e.g. Resolve) and the 4xxx series was simply not worth it bang-for-the-buck wise when that series came out. This one is, but at the margin on the specs, and my experience thus far matches those expectations. This card fits in a nice place with regard to price/performance; it is not "best" by any stretch but it has enough moxie that if you're coming from a 3060-series (or earlier) board the value on a price-performance basis is there, at least for rendering (I suspect gaming would be the same.)

Pros: 20Tb capacity and on sale at a reasonable price. CMR thus suitable for virtually all workloads. Be aware the Exos drives have a higher TBW rating (data transferred per year) so in some applications this MAY matter. In mine it doesn't. Plenty of experience with this series in different capacities, thus far no complaints or issues.

Overall Review: I like this series of disks and have been using them for a number of years without issues. Just be aware that there are multiple sellers, some of whom sell recertified or other "renewed" devices; if warranty is important you want them new and fresh, and the ones I received are with a "warranty starts from" date just a couple of weeks before I got them. These are intended for NAS and other similar uses where TLER (e.g. in a RAID configuration) is important. Desktop drives will retry excessively when there's a fault which is perhaps ok in a desktop, but in a RAID configuration is a bad thing as it hangs that volume for an extreme amount of time. Prior to this series I was heavily focused on the HGST devices but since the Iron Wolf Pro series came out I've had extremely good service out of them without problems. Provided you understand the limitations of spinning media and use it appropriately (so much these days is better on an SSD) these are excellent examples for rotating-media service. Recommended.

Pros: Reasonably priced for the performance and storage level. Typical Gen4 performance (fast) on reads, cacheless has its good and bad side.

Overall Review: I'm using this as a "secondary" drive for video file storage, where it works extremely well and replaces what was spinning rust. Being DRAM-less it is not as fast as the DRAM-laden nVME drives, but its also cheaper because you don't need those components. If you're on a budget its a perfectly good alternative to the DRAM-included ones, but IMHO the delta in price has come down a lot in the last few years so I'll still pop for the small additional cash for the system device. However, for a secondary storage drive such as what I'm doing there's little or no real benefit to the extra cost of the "top" level drives, and in addition to the money there's also power consumption; the addition chips use more power of course. So as "data storage" where most I/O will be sequential and especially if they're large files IMHO these are an excellent choice.

Overall Review: The midrange of spinning capacity these days is in the 8-12Tb range although it is looking like the 20Tb units will be in the game here shortly. I've got a bunch of these in different capacities in use and like them quite a bit; no problems in terms of reliability or performance. Recommended.