status: { DRDY ERR } ata3.00: error: { UNC }

[68492.671145] ata3.00: status: { DRDY ERR } 
[68492.671148] ata3.00: error: { UNC } 
[68492.899657] ata3.00: configured for UDMA/133 
[68492.899678] ata3: EH complete 
[68495.610841] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 
[68495.610851] ata3.00: BMDMA stat 0x24 
[68495.610857] ata3.00: cmd c8/00:08:55:e8:8d/00:00:00:00:00/e2 tag 0 dma 4096 in 
[68495.610859] res 51/40:00:56:e8:8d/00:00:00:00:00/02 Emask 0x9 (media error) 

ubuntu18.04 开机时出现的错误，原因硬盘出现坏道。

修复方法：

fsck -y /dev/sda2

reboot

正常启动