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Congratulations! Discount Coupon: HDD Zone (5% OFF for your order for a limited time!)... The hard drive PCB, or HDD PCB, is the Printed Circuit Board that is screwed into the back of the hard disk drive. If you have ever handled a hard drive, you may recognize the PCB as the green or blue board on the bottom of the HDD. The main function of the PCB is to supply power to the hard disk, data signal processing, etc. The main components are the "main controller chip", the "motor control chip", the "ROM chip", the "cache chip", and the interface... Buy hard drive PCB circuit boards for Data Recovery! Western Digital, Seagate, Samsung, IBM/Hitachi and Maxtor HDD PCB with Free Shipping!