In a RAID 5 array, data is striped and stored onto all but one drive. The last drive stores parity data for that stripe, for redundancy purposes. Which drives are used for data or parity alternates for each stripe.
Siena [1] is a medieval city in the region of Tuscany, located in the north of Italy some 70 km (43 mi) south of Florence. It is probably best known for a colourful horse race, Il Palio, conducted twice each year in the summer.
If you're coming up from Siena, follow signs toward Florence to get on the Siena-Firenze road, exit at Poggibonsi Nord and follow signs to San Gimignano. If you're coming from Pisa, follow the Firenze-Pisa-Livorno road toward Florence but don't go all the way to Florence, you'll end up driving more.