what is the good geometry for disk WD10EADS ?

[patpro ~ patrick proniewski]

Hello,

I've just added a WD10EADS disk in my FreeBSD box
(<http://www.wdc.com/en/products/Products.asp?DriveID=559>)

My mother board is few years old and supports only SATA I, so the drive
is recognized as SATA150 (which is fine):

ad6: 953869MB <WDC WD10EADS-00M2B0 01.00A01> at ata3-master SATA150

Unfortunately, I'm unable to find the right geometry in order to
format/label the disk. Using sysintall interface to handle the new disk
yields to this kind of alerts:

(1st alert) WARNING: �A geometry of 1938021/16/63 for ad6 is incorrect
(2nd alert) WARNING: �A geometry of 121601/255/63 for ad6 is incorrect
(3rd alert) WARNING: �A geometry of 121601/255/63 for ad6 is incorrect
(ad lib)

So, the software tries to guess the right geometry, but fails and stick
with wrong numbers (121601/255/63)

I have this:

# diskinfo -v ad6
ad6
512 �������� # sectorsize
1000204886016 # mediasize in bytes (932G)
1953525168 � # mediasize in sectors
1938021 ���� # Cylinders according to firmware.
16 ��������� # Heads according to firmware.
63 ��������� # Sectors according to firmware.

But fdisk thinks it's not good.

I don't know where to look, the BIOS says nothing about the geometry
(unless I've missed something). It's on LBA mode.

I've found a japanese site <http://d.hatena.ne.jp/sillywalk7/20090307>
that states that the correct geometry for WD10EADS could be 16383/16/63
(if the google translation is ok).
I've tried, and so far the disk properly mounts.

I'm still interested in a way to get the right geometry on FreeBSD, for
this drive.

patpro

--
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http://patpro.net/blog/index.php/2008/01/12/133