Replacing the M.2. cache drive with 256GB SSD in Yoga 14

Hope this is the right forum--didn't see one for the ThinkPad Yoga 14. I just picked-up a TPY 14 on Craigslist where the previous user had replaced the 1TB spinning drive with a 250GB Samsung 840 EVO drive. While this is very performant, the space is limiting. So my thought is to put the 1TB drive back in and replace the 16GB M.2 cache drive with a 256GB M.2 mSATA drive. Then I can run the OS/apps off of the mSATA drive and keep my data on the spinning disk. I'm not familiar with the M.2 interface and don't know what to expect in terms of performance, however. I know it will be drive dependant, but is the any reason to believe this will be noticably slower (or faster) than having a standard SSD? (Crystaldisk numbers would be great if anyone has this setup.) Also, if I put the 1TB spinning disk back in, am I likely to lose battery life (compared to the Samsung 840)? I know I should be able to answer that question, but I've never run this machine with the original disk. Thanks!

while i was around updating my thread, i figured i would chime in. i dont own your model or have expiriance with m.2 drives, however, if you look up the m.2 spec youl see that its basically just a micro version of the SATA port with a few extra bells and whistles, so it will be just as fast as your current SSD drive, only smaller. as to the battery drain by adding in the mechanical, yes, mechanicals use more power than SSD, you can sort of mitigate that by using a 5400 RPM drive instead of 7200 RPM (at the cost of access speed) and allow the drive to go to "sleep" when not used, that would work best by using the m.2 as the o/s drive, and the mechincal for data/programs. but, you might want to look in to things, i know on another system i own (none lenovo) it has an mSATA port, that port can be used to speed up the system with a cache drive using IRST, however, thats "all" the port can be used for, the system manu has it hard coded in the bios to not allow it for anything else, i found that out the hard way when i tried to use that port as the O/S drive instead... so keep digging. and i wish you luck.

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