Hi, All,
I'm curious what is that rectangular glassy whitish component that most of the HDD PCBs have? Attached is a compilation of the various HDD PCBs with that component shown.
Some facts about it:
- It is positionally marked like MT1 or SK1
- It is definitely polar, sometimes the PCB has "+" next to positive terminal
- Sometimes there are several of them on one PCB
- It is usually installed at a strange angle to the PCB, if there are several of them then they can be at an angle to each other
- Sometimes each of them has a dedicated IC next to it. Especially noticeable if there are several of them on different corners of the PCB
- Sometimes this component has a guard trace around it, like protecting a high impedance component from the noise.
Is it a vibration or acceleration sensor? Or a shock sensor that voids the warranty?