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Bug 82749

Summary:	Windows 2000 detects linux ext2 on boot, causing problems
Product:	[Retired] Red Hat Linux	Reporter:	Mike Traum <mtraum>
Component:	grub	Assignee:	Jeremy Katz <katzj>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	8.0	CC:	david.balazic, mitr
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2003-02-09 21:40:31 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1300182

Description Mike Traum 2003-01-25 20:19:03 UTC

Description of problem:
-----------PROBLEM DESCRIPTION-----------
When booting to Windows 2000, Windows detects the Linux drive and has the 
following problems because of this:
- Win2K attempts to run chkdsk on the ext2 drive, which it skip because it 
detects that it's not a windows file system
- Win2K boots very slow
- In event log: EventID 7022 "The Logical Disk Manager service hung on 
starting."
- ext2 was mapped by Win2K, which caused major problems when opening up file 
explorer. Resolved by removing the mapping through Disk Management
- Win2K Disk Management shows ext2 partition as Active
- tried to hide ext2 with grub, no affect in Win2K. When reboot, grub can't 
access ext2 so fails.
- The same problem was discussed at http://www.experts-
exchange.com/Operating_Systems/Linux/Q_20412213.html with no solution.

-----------CONFIGURATION-----------
- fdisk:
fdisk /dev/hda
   Device Boot    Start       End    Blocks   Id  System
/dev/hda1          1283      4100  22635553+  1c  Hidden Win95 FAT32 (LBA)
/dev/hda2             1      1282  10297633+  1c  Hidden Win95 FAT32 (LBA)
/dev/hda3   *      4101      4800   5622750   83  Linux
/dev/hda4          4801      4865    522112+   f  Win95 Ext'd (LBA)
/dev/hda5          4801      4865    522081   82  Linux swap
fdisk /dev/hdb
   Device Boot    Start       End    Blocks   Id  System
/dev/hdb1   *         1      9729  78148161    c  Win95 FAT32 (LBA)
- grub.conf:
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You do not have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /, eg.
#          root (hd0,2)
#          kernel /boot/vmlinuz-version ro root=/dev/hda3
#          initrd /boot/initrd-version.img
#boot=/dev/hda
default=1
timeout=10
splashimage=(hd0,2)/boot/grub/splash.xpm.gz
title Red Hat Linux (2.4.18-14)
	root (hd0,2)
	kernel /boot/vmlinuz-2.4.18-14 ro root=LABEL=/ hdd=ide-scsi
	initrd /boot/initrd-2.4.18-14.img
title Win2K
	rootnoverify (hd0,1)
	chainloader +1
title WinME
	rootnoverify (hd1,0)
	chainloader +1


Version-Release number of selected component (if applicable):
0.92-7

How reproducible:
Always

Steps to Reproduce:
1. Create patritions similar to mine
2. Install Redhat Linux 8.0 with grub
3. Boot up in Win2K
    
Actual results:


Expected results:


Additional info:

Comment 1 Jeremy Katz 2003-02-09 21:40:31 UTC

I haven't seen any other reports of this, but even if so, it's a Windows 2000
problem, and there's really not a whole lot I can do to fix those :(

Comment 2 David Balažic 2004-01-05 10:31:26 UTC

A clarification was posted at
http://www.experts-exchange.com/Operating_Systems/Linux/Q_20412213.html

In short :
 - mke2fs does not clear the first sector of a partition
 - if there was a FAT FS before, the FAT boot sector is still there
 - windows reads the boot sector ( even if the partition is clearly
marked as linux type )
 - windows sees FAT boot sector and thinks "oh, this is FAT, I know
this stuff"
 - windows fails in weird ways becasue the partition is not really FAT

Solution :
 - delete windows
or
 - zero the first sector of linux partitions during install/format