3.5" 640GB SATA Hard Drive. Western Digital WD Caviar 640GB. with Mac OS El Capitan pre-installed. Apple iMac. These were removed from 2009 A1225 iMac's. SATA Desktop Hard Drive 3.5". This is a used item so it may be dirty / very dirty / faded / yellow'ish / scratched / liquid marked / rusty and or have stickers / tape marks so it will not be in its original condition, if it's a multiple the one photographed may not be the one you receive.
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