E540 with 16GB SSD, what's that? M2-Slot free?

Hi
I'm wondering what that 16GB SSD is in this ThinkPad:
E540 with 16GB SSD
Is it a cache or is it a real SSD?
And how can I find out if the M2-Slot is free or not? Because maybe I want to install a M2-SSD.
Regards
Garfield

it is a real SSD, but it is used as a cache due to the small size. The M2 is not free, as it is occupied by the 16 gigs cache.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

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