HDD Geometry Issues

My HDD is an ST340810A 3.31. The BIOS gives its stats as:

Cylinder:     19158
Head:            16
Precomp:          0
Landing Zone: 19157
Sector:         255

I found the official doc at
http://www.seagate.com/support/disc/specs/ata/st3408
10a.html although
I'm not too sure how to interpret it.

When I go to allocate disk space during install, it says
that a
geometry of 77545/16/63 is incorrect and uses instead
4865/255/63. Even
when I reset the geometry to 19158/16/255, it says that's
wrong too.

If I use the entire disk with 'A', I see:

  Offset  Size(ST)       End   Name  PType     Desc  Subtype
       0        63        62   ---      12   unused     0
      63  78156162  78156224  ad0s1      8  freebsd    165
78156225      9135  78165359   ---      12   unused     0

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> 
> My HDD is an ST340810A 3.31. The BIOS gives its stats
as:
> 
> Cylinder:     19158
> Head:            16
> Precomp:          0
> Landing Zone: 19157
> Sector:         255
> 
> I found the official doc at
> http://www.seagate.com/support/disc/specs/ata/st3408
10a.html although
> I'm not too sure how to interpret it.
> 
> When I go to allocate disk space during install, it
says that a
> geometry of 77545/16/63 is incorrect and uses instead
4865/255/63. Even
> when I reset the geometry to 19158/16/255, it says
that's wrong too.
> 
> If I use the entire disk with 'A', I see:
> 
>   Offset  Size(ST)       End   Name  PType     Desc 
Subtype
>        0        63        62   ---      12   unused    
0
>       63  78156162  78156224  ad0s1      8  freebsd   
165
> 78156225      9135  78165359   ---      12   unused    
0

Somebody who really knows about this stuff needs to write
some
verbiage for the handbook.

What I have read and what seems to work for me is that the
geometry
on currently modern drives is "virtual" as far
as the OS is concerned
and that you should go ahead and just slice and partition
the disk
and build your file systems.   If it works, don't worry
about the
geometry messages.

////jerry

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Jerry McAllister wrote:
[ ... ]
>> If I use the entire disk with 'A', I see:
>>
>>   Offset  Size(ST)       End   Name  PType     Desc
 Subtype
>>        0        63        62   ---      12   unused
    0
>>       63  78156162  78156224  ad0s1      8  freebsd
   165
>> 78156225      9135  78165359   ---      12   unused
    0
> 
> Somebody who really knows about this stuff needs to
write some
> verbiage for the handbook.

  A
guy called Dan Strick did, once, and I even translated it to
SGML:

http://www.pkix.net/~chuck/doc/disk-geometry/article.ht
ml

-- 
-Chuck
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