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Hard drive platters number

Last response: in Storage
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I did some searching, and couldn't find any resources which gave me that information. I would read the label thoroughly, it might have some helpful information.

I had a bookmark on my son's computer that listed this info for every HD in production .... he reinstalled Firefox and lost it :( 

I know I posted it in one of the threads I participated in but w/ 4400+ posted messages, wasn't going to look for it tonite :) 
Related ressources

The advertised transfer rates on this model drive are between the 1 and 2 terr drives of the same interface- that much I did find out. Actually, the numbers are somewhat interesting. Taken from a WD document copyrighted 2010, the "data transfer rate (max) | host to/from drive (sustained)" for the black series are;
2T (sata 3G) 138MB/s
1T (sata 6G) 126MB/s
1T (sata 3G) 106MB/s
750G(sata 3G) 106MB/s
640G(sata 6G) 126MB/s
640G(sata 3G) 113MB/s
500G(sata 3G) 113MB/s

Thanks for your answers.

My HDD transfer rates are:
minimum:49.7 MB/s
maximum:104.4 MB/s
average: 84.0 MB/s

And the access time 12.4ms

I am suspicious because the drive runs idle at 42°C and it is so heavy and thick ...
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