All those plug/unplug, connector push/pull, cable twist, etc.
Unless it's not being moved, one of those will eventually fail specially the cable in my own experience.
If that happens while file is being written, it will corrupt something and its consequences on Bitcoin Core isn't simple to solve.
Of course, it depends on your usage.
The 128GB SSD with Linux is internal. The SSD I'll buy for Bitcoin is connected with USB. I'll remove the cable after use. I'll buy a new SSD for Bitcoin to stop sharing it on different Linux and Win11 computers. I'll be forced to download again if it gets corrupted.
It probably depends on the quality of the external SSD itself and the quality of the USB‑related hardware (ports, cables) as well. My node has been using high quality Samsung 870 EVO 2TB for more than two years with no issues. In my view, internal NVMe SSDs are less reliable because they tend to overheat more than often at least based on my own observations.
Samsung quality matters. Samsung EVO 2TB is better than 1TB Silicon Power. I'm using a cheap USB cable, I remove it after use. It's 3 years since I used my
1TB Silicon Power 2.5 SSD to test. It's a reliable SSD.
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