I am planning to purchase a portable HD for backing up my data on both my Windows XP lap top and my Mac Book Pro. I am planning to use just 1 HD for both backup. What would you recommend I get? I am assuming a USB connection.
I don't know what size you want, but I like WD drives.
One other thing your going to have to consider is formatting the drive so it works on both XP and OSX. You can either have one giant exFAT partition or two smaller partitions, one of them HFS+ and the other NTFS.