Same problem here, using Bitcoin Core Daemon version v0.16.1rc2
CentOS Linux release 7.4.1708 (Core)
in a virtualbox environment.
(internal hdd no USB)
I will need weeks, or months, to resynchronize from the beginning :-(
Bitcoin Core will need continuous connection to the drive and any sort of interruption will result in data corruption.
this is very bad. something have to be done to prevent a total corruption, I know the best way to have it done is to work on it myself.... I will try, but C my coding skills are not the best.
A workaround can be to backup the blockchain daily... I will try to implement this first.