ID ten Error

I was having trouble with my computer. So I called Richard, the 11 year old next door whose bedroom looks like Mission Control, and asked him to come over.
Richard clicked a couple of buttons and solved the problem.
As he was walking away, I called after him, 'So, what was wrong?
He replied, 'It was an ID ten T error.'
I didn't want to appear stupid, but nonetheless inquired, 'An, ID ten T error? What's that? In case I need to fix it again.'
Richard grinned. 'Haven't you ever heard of an ID ten T error before?'
' No,' I replied. 'Write it down,' he said, 'and I think you'll figure it out.'

So I wrote it down: I D 1 0 T
I used to like the little brat.