Thanks for the information. I use the Mac both as a standalone away from home and as a desktop unit attached to a 27" monitor, printers, Just-A-Bunch-Of-Discs hand-swapped backup drives. I am definitely not a power user. Are you a Mac user? Do you know if there are any incompatibilities with using the models and brands of drives you mention with the Mac OS 10.6.8, or later OSs 10.7.x and 10.8.x? Do SSDs cause the laptop to run hotter, cooller, or same temperature as the original HDD? I take it that you recommend the "enterprise grade" SSD for the boot drive and the ordinary SSD for the data drive, for reasons of reliability.
I hadn't thought about the old HDD crashing, other than to do my duty and back up regularly. Yes, I should just retire it to JABOD road warrior duty, along with my current road warrior JABOD 500 GB HDD.
1. Part of the time yes.
2. I've used the Samsung 840 Pro, Crucial C300 (not recommended any longer, but it was hot in it's day), Vertex 3 and 4, Intel 510, 520, 530, and others with Mac's.. no issues with compatibility. The OCZ Vertex and Vertex 150 are too new to know for sure, but I wouldn't expect issues of compatibility.
Compatibility with files in another issue, this is where you'd have problems IF you didn't delete any partition the disk came with, made a new one, and formatted it with the Mac OS. Typically hard drives come unpartitioned and ready to format in any system.. in contrast external drives often come formatted for PC/Mac out of convenience, but either one can be wiped clean and formatted for the other.
You might run into compatibility issues where the thickness of the drive is concerned. I think you're safe with 7mm and 9mm drives with any modern Mac product, though I tend to really like the 7mm drives (all I recommended are 7mm) when adding a second drive to a Mini with an OWC kit.. makes it easier.
3. Power = Heat. Because SSD's use less power they'll run cooler and your battery will last longer. In some cases like when watching a movie from a HDD.. A LOT longer. The more your program accesses the drive, the longer your battery will last over a mechanical HDD.. and movies/video access the drive continuously.
4. Any mechanical driive that's been in use over 3-4 years should really be replaced if you depend on that drive for work or backing up files. I use these small mobile drives for one of my annual backups.. Everything I created or worked on in 2013 will go on a 300gb drive (light year) I picked up for I think $29.. I'll write the data twice, put it back in it's static free bag, and it goes in a fireproof safe offsite. This is just one of three.. I consider it a last ditch effort. I figure the small cubic safe I bought just for storage will last an entire career. And if the format is every threatened I'll invest in replacement media and make the transfers.. then back in the safe..
People tend to think of mechanical hard drives as devices that last forever. They shouldn't instead consider them disposable with a 3 year usage life..
Hope this helps.