Is the hd about to crash? - DMA issue

One of the servers DMA is disabled from time to time, - at least it shows that under status in WHM:

Disk hda7 (/) DMA+ 66 %
Disk hda1 (/boot) DMA+ 19 %
Disk hda8 (/home) DMA+ 52 %
Disk hda5 (/tmp) DMA+ 4 %
Disk hda2 (/usr) DMA+ 66 %
Disk hda3 (/var) DMA+ 44 %
Disk hdb1 (/drive2) DMA+

When I choose 'Optimize EIDE Harddrives' in WHM it returns back to normal as above, but then DMA is disabled again and I have to optimize it again. Is this hard drive about to crash or why is this happening?

Thanks
John

 

 

 

 

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