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Eight-bay Thunderbolt 3 high-performance storage for photo and video.
Hard drives or SSDs.
Non-RAID or RAID-0/1/4/5/10.
Capacities up to 128 Terabytes!
Impossible to Complete a File Copy on Any Drives
Status 2013-01-19: extant in OS X 10.8.2, probably also in 10.7.x
Attempt after attempt, the Finder kept reporting the .DS_Store error shown below (it’s a Mac OS X hidden file created by the Finder). Each time, the Finder copy would abort, and there is of course no report on how many files were copied (great way to lose data, thank you Apple).
After about a *dozen* such failures, I gave up. All I wanted to do was to copy some folders to my main system via file sharing! Except that the problem is not limited to file sharing.

In this particular case, I ended up sharing the files on the source machine, then copying them to my main machine the other direction (“pull” instead of “push”).
But it’s not just about file sharing over the network: it happens on local copies also. So the bottom line is that basic, key, core functionality is often unusable. Most of the time file copying works fine. But sometimes it repeatedly fails. I’ve had to do large copies piece-by-piece at times in order to work around the problem.
Maybe Apple should make basic operations work properly instead of implementing dilettante eye-candy progress bars on file icons.
At much lower cost than Apple, with more options.
Lloyd recommends 64GB for iMac or Mac Pro for photography/videography.
Working theory
My working theory is that there is an internal threading bug inside the Finder: on a 12-core Mac Pro the chances of a thread-safety bug popping up are increased over that of a dual-core or quad-core machine.
For example, there might be one thread doing a file copy and another that creates the .DS_Store file for other (non copy related) reasons. Or there might be more than one copy thread. Or a create and copy thread, etc. A copy thread would be confused by finding an already existing file that it was tasked to create. Or there might be another system process or Finder helper process that also creates the .DS_Store file.
Not just networking issue
Apple knowledge base article HT1629 explains how to disable .DS_Store. In short, turn off the ugly behavior. In Terminal:
defaults write com.apple.desktopservices DSDontWriteNetworkStores true
If only it were a networking-only issue, but it is not. I have repeatedly had difficulty doing local file copies.

8-bay Thunderbolt 3
2.5 or 3.5 inch hard drives, NVMe SSD, USB-C, USB-A, DisplayPort 1.4, SD slot, PCIe slot, 500W power supply.
Non-RAID or RAID-0/1/4/5/10.
Capacities up to 128 Terabytes!
6000 MB/sec!
Mac or PC.
Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!