So one of my wd green drives showed a red thumbs down for the SMART report and when I hovered over it it said 19 reallocated sectors. But today it is back to green; what does this mean? Is my drive going to fail soon?

increasing reallocated sectors is a solid indicator for total drive failure.

was just looking at my other drives and saw this,

 

199 UDMA_CRC_Error_Count    0x0032  200  198  000    Old_age  Always      -      142

200 Multi_Zone_Error_Rate  0x0008  200  200  000    Old_age  Offline      -      26

 

what do these mean?

 

all of them have a number in the UDMA CRC Error part and only two have a number in the Multi Zone Error part.

In general, the disk notifications try to decide if the count is increasing. Since it has already warned you about 19, it won't warn you again until it goes over 19. I don't remember whether it remembers these numbers after a reboot, so it may warn you again then.

 

Known ATA S.M.A.R.T. attributes

ahh thanks for the info and the link. Does't look like those errors mean imminent electromechanical failure.

CRC errors most likely due to bad or loose cabling to the drive.