Hi Severin,
Go to Apple logo top left in menu bar > About this Mac > in Overview scroll 
down to Storage and you will see File System APFS

Cheers,
Ronni

 Ronni Brown’s iPad Pro 12.9-inch 256GB 


> On 19 Mar 2018, at 4:27 pm, Severin Crisp <[email protected]> wrote:
> 
> I am running High Sierra on an iMac with a fusion drive.   This not a 
> “native” Apple drive but was created by removing the DVD drive and replacing 
> it with a 500GB Samsung SSD which is teamed with the existing with the 
> existing 1TB HD to create the Fusion drive.  
> How can I check whether the SSD  is converted to APFS.   I never ran a High 
> Sierra beta.   
> Severin Crisp
> ____________________________________________________
> 
>              Assoc Prof R Severin Crisp, FAIP, FIP, CPhys
> 15 Thomas St, Mount Clarence, Albany, 6330, Western Australia
>                   ph (08) 9842 1950 ( Int'l +61 8 9842 1950)
>         Mob  0484 624 741    mail to: [email protected]
>   _________________________________________
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> 
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