HDD Errors

[Leonardo Maguetas Devai]

What is the possibility of a HDD being damaged if there is NO errors
acused in SMART, after a 'long' smart self-test session , but the kernel
is throwing me messages of 

hdd: drive_cmd: status=0x51 { DriveReady SeekComplete Error }
hdd: drive_cmd: error=0x04 { DriveStatusError }

hdb: drive_cmd: status=0x51 { DriveReady SeekComplete Error }
hdb: drive_cmd: error=0x04 { DriveStatusError }

?
What can be happening??

Thanks!
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