Once you have an extrenal drive that is formatted Mac OS extended (journaled) In general for a drive to be used as storage for your iPhoto library it must be formatted Mac OS extended (journaled) - you can check this by selecting the drive in the finder and getting info - it is is not formatted mac OS extended (journaled) you can reformat it using the MyPassport software or disk utility in your applications folder (note that this erases everything on the disk) Note that none of your questions have any thing to do with iPhoto - for specific answer on how to use yoru MyPassport disk you need to contact their suppor tor support forumsīy default the iPhoto library is stored in your Pictures folder (not in a my Pictures folder - not sure where you got that) - if you do not have a Pictures folder then you have deleted it - it is there by default on all new Macs