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What is compatible hard drive replacement for iMac EMC 2389 with Samsung hard drive installed? (Hard drive model is Samsung HD502HJ, it’s a factory installed hard drive.)

Samsung HD group was bought by Seagate. If you want to replace it you can use a Seagate drive as the sensor cable connection is the same. If you want to use a different drive here is the Apple P/N’s for the different sensor cables: 922-9215, Hitachi922-9216, Seagate922-9622, Western Digital