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seagate hard disk not detected. Does it spin? (what to do if you fried your drive by plugging in wrong power supply)\r
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If your seagate hard disk not detected, first of all, power it on and listen to it with your ear right next to it. Does it spin?\r
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If not, then it would be for one of the 3 reasons. Seized motor, unparked heads, or dead PCB (printed circuit board). There are also things like dead preamp, but on most brands of drives it would not prevent the spin up process.\r
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I will begin with explaining what seized motor is. Seized motor on the hard drive is fairly common issue that you would find on Seagate hard drive generations 7200.8 7200.9 7200.10 7200.11 7200.12, as well as some hitachi/IBM 2.5” hard drives.\r
Seized motor would upon start up process with create a faint buzzing, and in some cases beeping sound. I would highly suggest that you seek professional help at this point. This is one of the most difficult tasks to perform on the hard drive, and without necessary equipment you will kill your hard drive in attempt to recover it.\r
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However, these sounds are identical to the ones that the sound would make when heads are not parked properly. All modern hard drives offer touchless heads technology, meaning that the heads are never suppose to come in cont with the disk surface. In the past 3.5” hard drives used to park heads closer towards the center of the drive, and they would land right onto the platter surface that had air pockets to prevent sticking. That technology slowly started to get outdated and less reliable than touchless, so now hard drives park heads on the external parking ramp. Touchless technology offers more durability for the heads when the drive is off power. If it is dropped external parking ramp, that suspends heads in the air, is much better option than having heads sit on the ual disk surface. (this section is best to be read on our blog page here because I have pictures explaining the difference)\r
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Unlike 2 issues above, dead PCB, will turn your drive completely silent. PCB failure would usually be caused by power surges, or plugging in a wrong external hard drive power supply. Dead PCB can be either replaced, or repaired on component level. Luckily, TVS Diodes would protect most hard drives PCBs for mishaps like this, so they need to be tested first. A transient-voltage-suppression (TVS) diode or thyrector is an electronic component used to protect electronics from voltage spikes induced on connected wires. Multimeter with continuity test option will quickly determine if you have a damaged diode or not. Ideally, if you detect the damaged diode it would need to be replaced with an identical one, but in our case since I just needed to recover the data from this external hard drive. After the failed diode was removed, clients drive began to spin and get detected by our imaging equipment.\r
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