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Any idea whether SSD's are more or less reliable than standard disks?

I did a lot of hardware design until about 1965. Some of this design involved equipment that could not be repaired, so the reliability had to meet MTBF specifications established by an agency of the US government. In those days, the highest failure rates (surprisingly to me) were connectors (i.e., plugs and sockets). I think non-tantalum electrolytic capacitors were next. Things with moving parts were next. ...

So, while I have no data, I would expect that SSDs are likely to be more reliable than rotating disks of the same capacity. On the other hand, rotating disks that I used (the 10,000 rpm SCSI ones) never failed, and some of them I ran almost 24/7 for 10 years.
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