Hello Severin,

 Scan the disc as Administrator 
https://daisydiskapp.com/manual/2/en/Topics/AdminScan.html

Hidden Disk Space
Strange hidden space may also be caused by a third-party backup application 
that created a temporary disk image and then terminated abnormally without 
cleaning it up. Use ls -la /Volumes/ command in Terminal app to check if this 
is the case.
https://daisydiskapp.com/manual/2/en/Topics/HiddenSpace.html

Kind regards,
Ronni

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


> On 14 Mar 2019, at 4:06 pm, Severin Crisp <sevcr...@westnet.com.au> wrote:
> 
> I became aware of a reduction in free space on my MacAir, 250GB SSD, High 
> Sierra.  Daisy disk shows 84GB of Hidden Space sure enough.   I've so far 
> been unable to locate this except that it is in the system, total nearly 
> 100GB.  Pointers on how to find and remove this please!
> Severin Crisp
> 
> ________________________________
> Assoc Prof Severin Crisp, FIP, FAIP
> Clarence Estate, 55 Hardie Rd,
> Albany, Western Australia, 6330
> (Home:  15 Thomas St, Mount Clarence,
> Albany, Western Australia, 6330)
> Ph 0484 624 741
> Email: sevcr...@westnet.com.au
> ________________________________                  
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> 
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