Seagate Barracuda 7200.7 St3120827AS model.
For the Seagate hard disk model ST3120827AS, the TVS diode is typically located on the circuit board (PCB). TVS diodes are designed to protect electronic circuits from voltage spikes and transient events. They are usually small, with two leads, and look like small cylindrical or rectangular components.
To locate the TVS diode on the circuit board, you may need to refer to the hard drive's datasheet or schematic diagram, if available. Additionally, you can try searching for online resources or forums where individuals share information about hard drive components and their locations.
Regarding the Cisco Nexus Network Switch , it's important to note that specific details about the internal components, including the location of TVS diodes, may be proprietary and not readily available in publicly accessible documents. For detailed information about the switch's internal components, you may need to refer to Cisco's official documentation or contact Cisco's support
https://www.serverblink.com/n3k-c31108pc-v-cisco-nexus-network-switch/
Hi! Here some hint. It is more often located at supply entry point. Pls check the image attached here as sample and for your reference. Goodluck. 
SOURCE: hard disk I/O error cannot formate harddisk shows no fixed disks how to solve
Please try to check with your cmos system if it was detected, if not means your harddrive was absolutely damage.
Please rate me solved!
Best regards,
Philip
SOURCE: My seagate barracuda 7200 b will not boot up. It has been operating fine for the last 8 months
i suggested you use NORTON DISK DIAGNOSTICS to repair the MBR(master boot record)the master boot record is bad and you can use winXP bootable nto repair the drive by pressing R after booting is completed.but you need to be able to use DOS prompt before you can do this
SOURCE: Hard disk Not Detecting (Media Problem)
may be comming steps you solve your problem
check your bios settings on first bootable devices
check your ide or sata cable interfacing mother board correctly
check the power connections
also you want check this one is your os faulty,now you make master &sleve and boot anther hard drive
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