[SOLVED] "Update Library"....not working after in-place update to 8.3.7

[Tonewheelkev]

How many tracks in the collection?
Are the USB drives powered or do they use USB port power?

Drives plugged directly into Pi.....so just using port power....which I'm thinking to be a limiting factor.
Now searching for a suitable....Pi friendly....Powered hub I suppose!

Haven't counted tracks yet..... but must be around 5000.