Samsung 840 EVO SSD. Reduce Total Bytes Written (TBW)

The single best thing you can do for your SSD to prolong its life and keep it fast and responsive is to install TRIM Enabler. This will allow it to manage its own free space effectively, because Mac OS X will then notify it when blocks are deleted, allowing it to re-use that space. Otherwise it chokes on the deleted data and dies.

I use the free version of TRIM Enabler available from here:

http://www.cindori.org/software/trimenabler/

The "pay" version has additional measurement features, which you can add at any time by coughing up the about US$10.

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This User Tip discusses organizing your drives the way the new Black cylinder mac Pro does --putting all User files on a secondary drive:

User Tip: Creating a lean, fast Boot Drive

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TRIM Enabler makes a similar (possibly even identical) patch. It allows you to conveniently turn TRIM on and off. With the manual patch, un-installing and re-installing is more cumbersome.

Mac OS X contains over 250,000 files. I do not think you need to be concerned about installing one more. TRIM Enabler install a Launch Daemon, but not an intrusive kernel extension.

That is a very interesting question. Both of those hacks work by patching a small piece of code so that it "forgets" to check for Apple brand SSDs, and allows TRIM for every SSD. TRIM Enabler is supposed to automatically "put back" the un-patched version when you turn it off. (that is one feature that makes it superior to hand-patching.)

But it you install it on a System you have hand-patched (but not un-patched) the version that will be set aside will be the hand-patched version, and that is what will be "put back" when you turn TRIM Enabler off. So they do not interfere with each other, but the results may not be exactly as expected in the case I mention.