Hi, Here's my plan. I ordered two new Seagate PATA drives: a 500GB for storage and a 750GB for backup. These external drives are in addition to my iMac's internal 250GB drive. The external HDDs will be cased in OWC cases w/ firewire. Here are my questions: 1) Should the external 500GB HDD (extra storage) be set to Master, Slave, or Cable Select? 2) Should I daisy chain the external 750GB (backup) to the 500GB external HDD, or should it go into the other FW port on the iMac? 3) What jumper setting should I set for the 750GB (backup) external HDD? Master, Slave, Cable Select? Thanks in advance for answering what are probably very basic questions.