What is a data cylic error & how can I make it go away?

[Katymac]

I get it when I try to create a new folder within a folder iyswim

No it says

Data error (cyclic redundancy check)

Hope this helps

Thanks - I tried the turn it off & turn it on again & it worked

It can also point to the start of harddrive problems...

I have taken preventative action

I have backed up everything in 2 places

Thanks for the warning