Teracopy's official page [1] says "TeraCopy uses dynamically adjusted buffers to reduce the seek times.".
Wikipedia points to [2] some tests:
In a test conducted in 2008 by lifehacker, Fastcopy was several times faster than it's rival Teracopy, a program with similar functionality. However, both programs have been updated since then. A more extensive comparison was performed between TeraCopy v2.07beta, KillCopy v2.85, FastCopy v1.99r4, SuperCopier v2.2bet and published on a forum in 2009.
I'm looking for more recent speed tests on Windows 7.
ACCEPTED]
With lots of small files, robocopy [1] (native) works just as well as teracopy.
Teracopy can handle larger files a little bit better according to this [2].
Here is another unverified benchmarking [3] with pictures!
I use robocopy and it's fine.
[1] http://technet.microsoft.com/en-us/library/cc733145.aspxHave been using TC for two years now, on Win7 x64. Never had any "real" troubles with it. It's faster, yet I don't have exact information.
There's a bug in there somewhere, sporadically shutting down the process before it even starts, fixable by restarting TC a few (insert random number) times, till it works. It never quits in the middle, only when a Paste-command is made.
For the harder times, I've enabled the Scroll-Lock feature, to toggle between Windows' service, and TC.