I spotted this link for the 6Gbps SATAIII mSATA drive:http://www.runcore.com/en/RC-SSDProductShow-173.html
thinking about getting one myself.
I too would say folks may consider giving software RAID a try for your D: drive, simply using Windows 7 x64 built in RAID0 function to stripe the data:http://support.microsoft.com/kb/323433
Twice the capacity, and nearly twice the read AND write speeds. Admittedly more risk, so backup daily. And as mentioned, you'd need to set that DVD drive aside, since you'd need that ultrabay adapter, for the 2nd spinning drive.
That's pretty much what I did when I got my W700 race-work-horse 3 years ago that I'm now replacing, see my signature below. That W700 was pre-mSATA days, where W700 dual inner drive bays housed 2 traditional spinning drives, and I booted from the Ultrabay's SSD C: drive, discussed here:viewtopic.php?t=68840
When playing with drive configurations back in Oct 2008, I found that the hardware RAID of the W700 was especially annoying if it kicked off an integrity check when I was on the road after Vista crashes of any sort. This check was a multi-hour proposition, not acceptable when trying to work. No errors were ever found, just lots of productive time lost.
I had also noticed that the motherboard/Intel RAID dervice driver combo RAID didn't seem to use any more or less CPU cycles than my Windows 7 software RAID, and wasn't really faster, verified with free ATTO Disk Benchmark) http://www.attotech.com/products/produc ... _Benchmark
Also, my daily backup solution, Windows Home Server, didn't have any problem with backup or bare-metal restore. Another perk: I could also mount that data drive D: RAID0 array by merely importing the drive pair on any windows machine while my laptop was away for repair.
I don't know if those long RAID integrity checks would happen with the RAID chipset in the modern W520, but in my case, I won't be finding out first hand either. The W520 without RAID was chosen for me, so no RAID for me. At least I know I'm not really going to be missing anything important, since I'm already accustomed to a small C: and a large D: drive, I'll just re-use my 2 hybrid Momentus XT 500GB drives, and try to find a good mSATA drive that's fast and affordable. And if something bad happens to my OS (about 2-3x per year these past 3 years, where I regret a change that I can't easily back out of), I just restore my C: drive in under an hour and leave my large D: drive alone.
All that said, having played with Sandybridge / Z68 desktop chipsets that have RST recently (SSD caching of single large drive volume, described at http://tinkertry.com/glossary
), I would have preferred something like that on my W520, with 2x1TB laptop drives like the WD Scorpio Blue WD10JPVT, giving me 2TB of SSD-like speeds, and the convenience of one big C: drive.
Oh well, if Seagate Momentus XT Hybrid 1TB drives ever come out, I'll probably then get similar performance anyhow.
Just some food for thought, each user's needs will vary, of course.
2757CTO Lenovo W700 with 17"1920x1200, NVIDIA Quadro FX3700M
C: UltraBay Intel X25-M 80GB SSD, Windows 7 x64 SP1
D: ST9500420ASG Seagate Momentus 7200.4 500GBx2 Software RAID0http://tinkertry.com/thinkpadw520saga