s ▁announced ▁it ▁as ▁a ▁Mac - compatible ▁product ▁with ▁a ▁ 5   GB ▁hard ▁drive ▁that ▁put ▁" 1 , 0 0 0 ▁songs ▁in ▁your ▁pocket ." ▁ ▁Apple ▁did ▁not ▁develop ▁the ▁i Pod ▁software ▁entirely ▁in - house , ▁instead ▁of ▁using ▁Portal Player ' s ▁reference ▁platform ▁based ▁on ▁two ▁AR M ▁cores . ▁The ▁platform ▁had ▁rud iment ary ▁software ▁running ▁on ▁a ▁commercial ▁micro kernel ▁embedded ▁operating ▁system . ▁Portal Player ▁had ▁previously ▁been ▁working ▁on ▁an ▁IBM - brand ed ▁MP 3 ▁player ▁with ▁Bl uetooth ▁head ph ones . ▁Apple ▁contract ed ▁another ▁company , ▁P ix o , ▁to ▁help ▁design ▁and ▁implement ▁the ▁user ▁interface ▁under ▁the ▁direct ▁super vision ▁of ▁Steve ▁Job s . ▁As ▁development ▁progress ed , ▁Apple ▁continued ▁to ▁ref ine ▁the ▁software ' s ▁look ▁and ▁feel . ▁Starting ▁with ▁the ▁i Pod ▁M ini , ▁the ▁Chicago ▁font ▁was ▁replaced ▁with ▁Esp y ▁Sans . ▁Later ▁i P ods ▁switched ▁fonts ▁again ▁to ▁Pod ium ▁Sans — a ▁font ▁similar ▁to ▁Apple ' s ▁corpor ate ▁font , ▁My ri ad . ▁Color ▁display ▁i P ods ▁then ▁adopted ▁some ▁Mac ▁OS ▁X ▁them es ▁like ▁Aqu a ▁progress ▁bars , ▁and ▁br ushed ▁metal ▁meant ▁to ▁e voke ▁a ▁combination ▁lock . ▁In ▁ 2 0 0 7 , ▁Apple ▁modified ▁the ▁i Pod ▁interface ▁again ▁with ▁the ▁introduction ▁of ▁the ▁sixth - gener ation ▁i Pod ▁Classic ▁and ▁third - gener ation ▁i