Error log is :

Backup detected log corruption in database Wss_Content. Context is Bad Middle Sector. LogFile: 2 'D:\Data\xxxx_log.ldf' VLF SeqNo: x280d VLFBase: x10df10000 LogBlockOffset: x10efa1000 SectorStatus: 2 LogBlock.StartLsn.SeqNo: x280d LogBlock.StartLsn.Blk: x8477 Size: xcc00 PrevSize: xec00