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Re: 4k sector drives

To: xfs@xxxxxxxxxxx
Subject: Re: 4k sector drives
From: Khelben Blackstaff <eye.of.the.8eholder@xxxxxxxxx>
Date: Wed, 21 Jul 2010 13:33:48 +0300
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> I have these:
> Model=WDC WD20EARS-00MVWB0, FwRev=50.0AB50, SerialNo=WD-WMAZ20035646
> Model=WDC WD20EARS-00MVWB0, FwRev=50.0AB50, SerialNo=WD-WMAZ20028252

> Any chance to get Linux know they are 4k sector drives manually?

Your revision numbers are different than mine, because you have the 2TB drive,
but i guess its the same for these too. You can try "hdparm -I /dev/sdX" 
(capital i)
or "cat /sys/block/sdX/queue/hw_sector_size" to see what they report.

Mine report "Logical/Physical Sector size:           512 bytes"
There are newer revisions that report "Physical Sector size: 4096 bytes"

Nevertheless, you don't have to get them to report 4k to linux. As long as you
align the partitions its fine. As i said in the other post, newer fdisk doesn't 
"DOS compatibility mode" and uses sectors by default (instead of stupid CHS)
with a 1MB alignment, so every partition will be properly aligned. If you don't
dual boot Windows, you can also use GPT partitioning scheme.
Also, from what i have seen, xfsprogs are quite clever and find most stuff on
their own. I usually mkfs with "-s size=4096" just to be sure.

Slightly offtopic, there is another "problem" with these drives. They park the 
every 8 seconds, so they _might_ wear prematurely. You can change the 8sec timer
or disable it with the wdidle3 utility from this url

If you want to know more about the problem, there are many forums where
you can read about wdidle3 and i also posted about it on my blog.

I hope i helped.

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