Both HD's identical models - went & formatted the wrong one
I highly recommend small adhesive labels (small circles in different colours) or even tippex to provide distinguishing features.
I learnt this, not from computers, but when going to reinstall the h/t leads to a 5-litre V8 engine after removing them all at once to replace the spark plugs. Believe me, you don't want the cylinders in a £7,000 engine firing in the wrong order!
SD