disk geometry confussion

piotr.smyrak at heron.pl piotr.smyrak at heron.pl
Wed Oct 6 18:30:16 PDT 2004


I had a disk failure recently, and bought a new drive afterwards. it 
is 80GB WD800BB model. I went on with a fast install to restore my 
ability to work. I created a small slice in the leading gigas. Now I 
wanted to go on with slicing the disk, but I got stuck.

When I get to sysinstall's fdisk I get a warning that my geometry is 
incorrect and an explanation as follows:

you need to enter whatever your BIOS thinks the geometry is!
For IDE, it's what you were told in BIOS setup. (...) 
_Do NOT use phisical geometry._

The BIOS recognizes my disk as: 38309/16/255. The fdisk when started 
claims 155061/16/63 is wrong, when I follow and press G to setup the 
correct values, it presents me with 9729/255/63. I tried all of 
them, but I always get the incorrect geometry message and whenever I 
try to write changes to disk, I get: 

ERROR: Unable to write data to disk ad0
Disk partition write returned an error status

OK, so here it states smth contrary to the sysinstall warning:

...that I should follow with disk CHS values. I got them from WD 
site (16383/16/63), and these are the only ones fdisk do not 
complain when entered, but! it is the contrary to what the fdisk 
warning states when run:

_Do NOT use phisical geometry._

Please enlighten me. What way I should follow? 

 Piotr Smyrak
 piotr.smyrak at heron.pl

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