How I find f drive on Lenovo i7 g50-45 I have lost that drive?

If you had an F drive then you have possibly unplugged it as it could have been a USB devise
In normal systems there are
Drives as in
A = floppy (not many about these days
B = sometimes this is like RAM
C = Normal drive for the OS and program files
D = First storage drive
E= either HDD or optical, or SSD
F = as (E drive)
G = as (E drive) and so on each drive is given the next available letter unless one is assigned a specific