Hi, I've been looking at the different deals/options for Dell Dimensions. They sure do make it complicated with all the different deals and configurations etc. Anyway on one of the DIM3100 configurations (the one with the coupon discount) I was confused by the choices in the hard drive section:

160GB Serial ATA 3Gb/s Hard Drive (7200RPM) w/ 8MB cache [add $100 or $3/month1]


160GB Serial ATA Hard Drive (7200RPM) [Included in Price]

What is the difference between these two hard drives? Thanks if anyone can help.