Here is something I've never seen before. We have a 2012 system with several internal SATA drives. One day one of these drives just disappeared - nowhere to be seen in dism manager, etc. We scanned for it, etc. no luck. We then rebooted the system and
the drive showed up with all the data on it intact. This happened several times more and so we took the drive off line put it in a USB enclosure and all the data showed up and it was used to copy to another drive temporarily. We then replaced it with
a brand new drive that was formatted and then left around blank for several weeks, never disappearing. The other day when we went to put some data on it for the first time, within a short time it also disappeared. We haven't rebooted - we need to leave the
server up until an outage window - but I imagine it will show up again on a reboot.
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