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Date: Tue, 20 Dec 1994 12:42:17 GMT
From: muir@idiom.com
Reply-To: muir@idiom.com
To: FreeBSD-gnats-submit@freebsd.org
Subject: fdisk generates bogus numbers, doesn't accept overrides
X-Send-Pr-Version: 3.2

>Number:         76
>Category:       conf
>Synopsis:       fdisk can't be trusted.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    core
>State:          closed
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Dec 20 17:20:03 1994
>Closed-Date:    Tue Feb 6 22:13:45 PST 1996
>Last-Modified:  Tue Feb  6 22:15:29 PST 1996
>Originator:     
>Release:        FreeBSD 2.0-RELEASE i386
>Organization:
Idiom Consulting
>Environment:

	NCR 53c810 scsi contoller.

	My disk is 3511 cyl, 11 heads, 108 sectors/head.  I'm only
	using the first 1228800 sectors.  I only have one slice defined
	and it covers the entire disk.

>Description:

	I wanted to shrink the size of the slice down to the amount
	that I'm actually using.

	The first problem is that fdisk thought that my drive geomentry
	was 3050 cyl, 11 heads, 125 sec/head.  I told it otherwise.

	Then I go to redefine slice 0. I tell it the size should be
	1228800.  It asks if I want to speicfy the beginning and end.
	I say "no".  It fills in 10 cyl, 4 heads, 20 sec!
	
	Next round, I say yes and fill in 1034 cyl, 3 heads, 84 sec.
	It displays 10-4-20!

	(Actaully, there were a few more rounds in there, and on some
	of them it accepted what I wanted for and ending cyl)

>How-To-Repeat:

>Fix:
	

>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed 
State-Changed-By: pst 
State-Changed-When: Tue Feb 6 22:13:45 PST 1996 
State-Changed-Why:  
Fdisk is regulated by the stupidity of the on-board BIOS, which limits 
you to 1024 cylinders (or modulo 1024 cylinders).  Create a small slice 
for your root partition only.  Create a second slice containing the rest 
of the disk, and go from there. 
>Unformatted:


