You can easily find out the zener voltage. Power on the drive and measure the voltage on the pads where the zener was and that will be the normal voltage. If you measure 3.3V then the zener is 3.3V. Then buy any standard smd zener with the same package and voltage and replace it later.
Hello! This is actually a very good suggestion and I will definitely try do it! Only, I opened another drive that had this component intact and I'm not so sure that it's a Zener diode, but possibly a different protection diode (at least it was for that drive), as far as I can believe the internet. It looked more like a Varicap Diodes type, but still need to investigate this topic to be sure! For one drive, I replaced a diode from another drive that had a damaged magnetic read section. It turns out that in the power part circuitry is somewhat similar to SSD.
