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Old 10-21-2001, 01:05 AM   #1
iggymac
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Registered: Aug 2001
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redhat installer sees 257 cylinders


I have a homebuilt system with 1 ata 33 drive (13gb).

I have 1 dos part. for windows (hda1) that is 3gb.

I have sucessfully installed turbolinux (and redHat 6.0) on this system and it had no problem with my disk logical geometry (c=1662 h=255 s=63).

But when I run the RedHat 7.1 installer it says I have 257 cylinders and so reports that even my dos part. is too big and will not let me create new parts.

Even if I run fdisk within the installer and change the cylinders to the correct amount it still reports 257.

Disk Druid says the same, of course.

I recently erased this whole drive because I had a part. table problem. but windows and turbolinux install and see the drive fine now.

What's the deal?

Thanks.
 
Old 10-21-2001, 04:01 PM   #2
mcleodnine
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You may need to change the disk geometry back to more 'standard' settings as I think RH defaults to the 'lba32' mode for the boot loader.

You can do this (if you know the settings) in fdisk (linux) by using 'x' for the extended functionality and then change the C/H/S settings. You will then need to create at least one partition (you can delete it after you reboot) as the settings don't 'stick' without doing this (at least my version seems somewhat clueless for this procedure).

If all else fails you can download a utility from the driver manufacturer to completely wipe the platter clean. It takes a couple of hours...

Both procedures mentioned above will DESTROY any data on the drive.
 
Old 10-23-2001, 01:31 PM   #3
iggymac
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The latest:

I used tom's rtbt fdisk to make a swap and / partition and the redhat installer ran fine and installed ok.

Now when linux boots it correctly reports my drive's C|H|S in dmesg, but still will not let me use fdisk or cfdisk on it because they still think there are only 257 cylinders.

I have not tried the previous poster's recommendation of trying to change the cylinders and then adding a partition temporarily yet because he says it will destroy the contents of my drive.

Everything else seems to be working.

Any other thoughts?

Thanks.
 
Old 11-06-2001, 05:17 PM   #4
skaltavista
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Smile

It seems to me that you should be okay if your only problem is that fdisk doesn't agree with Windows about the geometry. If you're still concerned about this, please post the CHS geometry as used by Windows and also the output of Linux fdisk when you do x (eXtra functionality) and then p (Print the partition table). Also, include the CHS as specified by the drive's manufacturer.

For a thorough look at disk geometry, the BIOS, the ATA standard and all of the problems these have caused, see the most excellent Andries Brouwer's Large Disk Howto here: http://www.ibiblio.org/pub/Linux/doc...rge-Disk-HOWTO
 
Old 11-07-2001, 06:06 PM   #5
iggymac
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Thanks for the reply.

But at this point I am planning to erase the whole thing again and start over.
 
Old 11-10-2001, 07:26 PM   #6
skaltavista
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That's groovy, but fdisk'll probably say the same thing as before.

If you have any more partition problems, feel free to post the relevant information and I'll see if I can figure it out.
 
  


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