Re: [smartmontools-support] How to decode raw Seek Error Rate for Seagate HDs

[Bruce A. <bru...@ae...>]

Hi Franc,

Thanks for this information.  Do you want to send a patch for smartctl 
with a '-v' option to interpret this Attribute correctly?

Cheers,
	Bruce

Franc Zabkar wrote:
> After extensive testing and research I've come to the conclusion that 
> Seagate's raw Seek Error Rate attribute consists of two parts, a 
> 16-bit count of seek errors in the uppermost 4 nibbles, and a 32-bit 
> count of seeks in the lowermost 8 nibbles.
> 
> Here are two Usenet threads where I have worked through various 
> examples and performed some testing:
> 
> http://groups.google.com/group/comp.sys.ibm.pc.hardware.storage/browse_thread/thread/54b8ad6d34549e95/de20c3e867d856ba#de20c3e867d856ba
> 
> http://groups.google.com/group/comp.sys.ibm.pc.hardware.storage/browse_thread/thread/9519f7ad86d7be72/954cc1cd9df89d0b?#954cc1cd9df89d0b
> 
> I believe that the cooked value of the SER attribute is logarithmic.
> 
>   90% =  < 1 error per 1000 million seeks
>   80% =  < 1 error per 100 million
>   70% =  < 1 error per 10 million
>   60% =  < 1 error per million
>   50% =   10 errors per million
>   40% =  100 errors per million
>   30% = 1000 errors per million
> 
> I also believe that a new drive begins life with a cooked value of 60.
> 
> -Franc Zabkar
> 
> 
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