I'm pretty sure the reason you could see no drives is that you didn't have the relevant mass storage drivers. If the caching solution is using Intel Rapid Storage Technology, you may see no drives on the install screen as the device would not have had drivers that existed when Windows 7 came out, therefore has no idea about how to load the storage controller during setup.
The (potential) solution to this would be to grab the relevant drivers and unpack them to a folder on the USB stick, then during the windows 7 setup, you can click 'load drivers' on the drive selection screen, and feed it the drivers required, then it should hopefully load those and let you see the drives. Which drivers exactly you'll need I'm not sure.
Looking at the Toshiba support page, only windows 8 is listed for that laptop but the drivers would probably work with windows 7. It looks like the only SATA drivers available are from intel, though theirs might be customised. You could try downloading them I guess. They are HERE
and in theory might let you do the install 'properly' with the hardware as it shipped.
The procedure would be, put all the original hardware in, including the mSATA SSD, then boot from USB, at the drive selection, click 'load driver' and then give it the drivers you unpacked from that download above. Once that is done, refresh the available drives list, and then install onto the standard hard disk. Once windows is fully installed and working, you'd then install the next driver (from HERE
), which includes Intel control panel, and use that to turn the SSD into a cache for the hard disk.
If you are using Windows 7 x64 then you do also have the option of installing using UEFI which should (marginally) speed up boot times. Here is a how-to
on modifying the USB files for windows 7 slightly to allow it to boot from USB using UEFI. I've only tried it once but it did work, I had no caching to contend with, though
The Intel caching is pretty effective at accelerating things, so I'd definitely try getting the install working and utilising it. Then again, if you do not wish to rock the boat having got this working well enough, you can just disregard this post