I've had a general-purpose IDE/SATA connector for a few years, but it
runs into a 2TB limit with modern large drives.
Most SATA-only connectors have a 2TB, or don't mention what limit
they may have. The key feature of this one is that it claims to cope
with drives up to 6TB (though a label on the bottom says 4TB); I've
tried it up to 4TB, which is what I'm using in the current fileserver,
and not had any problems.

Connectivity is USB3 or eSATA. I've only used USB, and it seems happy
to saturate a USB2 link.

Rather than using a free-floating connector, drives are inserted into
a slot on top of the machine, onto a connector protected by a
dust-shutter.

Why it's not exactly cuboid (yes, the top does slope, and the drives
aren't inserted on the vertical either) is a question for the
designers; if one had several of these side by side there'd be a fair
bit of wasted space. But it could be worse.
Any dock/connector ought to work without hassles; I'm recommending
this one because it's solidly built and at least a bit of thought
seems to have gone into the design.
Comments on this post are now closed. If you have particular grounds for adding a late comment, comment on a more recent post quoting the URL of this one.