2018-02-22 01:24:37 IO error: Win32WritableFile.Sync::FlushFileBuffers F:\work\Bitcoin core\blocks\index\001215.ldb: The request failed due to a fatal device hardware error.
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2018-02-22 01:24:41 IO error: Win32WritableFile.Sync::FlushFileBuffers F:\work\Bitcoin core\blocks\index\000001.dbtmp: The request failed due to a fatal device hardware error.
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2018-02-22 01:24:42 CDBEnv::EnvShutdown: Error -30974 shutting down database environment: DB_RUNRECOVERY: Fatal error, run database recovery
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2018-02-22 01:24:48 IO error: Win32WritableFile.Sync::FlushFileBuffers F:\work\Bitcoin core\blocks\index\000001.dbtmp: The request failed due to a fatal device hardware error.
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2018-02-22 01:24:49 IO error: Win32WritableFile.Sync::FlushFileBuffers F:\work\Bitcoin core\blocks\index\000001.dbtmp: The request failed due to a fatal device hardware error.
It seems like your hard drive is somehow broken and this led to your data getting corrupted.
Did you already check whether your HD is working as intended?
You could try to read out the S.M.A.R.T values of your HD and see if everything works as it should. [1]
My guess would be that your HD got corrupted during v0.14.2 and core wasn't able to read those files after updating to 0.15.1
[1] Tools to read out S.M.A.R.T. values:
https://en.wikipedia.org/wiki/Comparison_of_S.M.A.R.T._tools