External HD question

i guess combination hardware/software question regarding time capsule , airport extreme , external hd put here in peripherals section.

picked usb hard drive kit macsales week or 2 , hooked imac without issue , using backup drive through time capsule. picked airport extreme ebay arrived yesterday , set in matter of minutes. plan set drive network drive imac , mbp. late that? possible 2 different computers same external hd?

being new stuff, i'm sort of trying figure out , replace 500g drive i'm using bigger if can backup both systems same drive. don't work on major @ these computers , concerned pictures , music primarily. more importantly i'd have working knowledge hardware , how interacts software. in advance help.

 

just hooked external drive usb port of airport extreme. should next. can't seem locate , thought pop "discovered" somewhere on imac. suggestions?


edit: went time machine imac , found drive on airport extreme. next step check out on mbp. thanks.

 

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