Date: Sat, 19 Jul 1997 12:19:06 -0400 (EDT) From: gbuchanan@sympatico.ca To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: bin/4120: Partition sysid for extended DOS partition mount. Message-ID: <199707191619.MAA00341@localhost.on.sympatico.ca> Resent-Message-ID: <199707191620.JAA01427@hub.freebsd.org>
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>Number: 4120
>Category: bin
>Synopsis: Partition sysid prevents extended DOS partition mount.
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Sat Jul 19 09:20:01 PDT 1997
>Last-Modified:
>Originator: Gardner Buchanan
>Organization:
Gardner Buchanan
>Release: FreeBSD 2.2.2-RELEASE i386
>Environment:
FreeBSD akbar 2.2.2-RELEASE FreeBSD 2.2.2-RELEASE #0:
Thu Jul 10 22:41:04 EDT 1997
root@akbar:/usr/src/sys/compile/AKBAR i386
PAO-970616.tar.gz
Toshiba 430CDT Laptop computer, Pentium 120, 16Mb, EIDE Disk
>Description:
Evidently Microsoft has begun using the partition sysid #15 for
certain types of DOS extended partitions.
joerg_wunsch@uriah.heep.sax.de writes:
We also recently noticed that Winlose 95 % started to use Sysid
#14. Ain't it fun? They always invent something new.
Here is my situation:
-----------------------------------------------------------------
# fdisk
******* Working on device /dev/rwd0 *******
parameters extracted from in-core disklabel are:
cylinders=658 heads=64 sectors/track=63 (4032 blks/cyl)
parameters to be used for BIOS calculations are:
cylinders=658 heads=64 sectors/track=63 (4032 blks/cyl)
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 0 is:
sysid 6,(Primary 'big' DOS (> 32MB))
start 63, size 822465 (401 Meg), flag 0
beg: cyl 0/ sector 1/ head 1;
end: cyl 203/ sector 63/ head 63
The data for partition 1 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 822528, size 1225728 (598 Meg), flag 80
beg: cyl 204/ sector 1/ head 0;
end: cyl 507/ sector 63/ head 63
The data for partition 2 is:
sysid 15,(unknown)
start 2048256, size 604800 (295 Meg), flag 0
beg: cyl 508/ sector 1/ head 0;
end: cyl 657/ sector 63/ head 63
The data for partition 3 is:
<UNUSED>
# ls -l /dev/wd0s5
brw-r----- 1 root operator 0, 0x00060002 Jul 13 20:17 /dev/wd0s5
# mount -r -t msdos /dev/wd0s5 /mnt
msdos: /dev/wd0s5: Device not configured
-----------------------------------------------------------------
This contradicts what the current FreeBSD handbook tells me to expect.
Notice that the partition type flag for my extended partition is not
recognised by fdisk. Is it maybe not being recognised by the slice
code or the msdos filesystem? This partition was created by Win95
OSR2's fdisk. I formatted it as a vanilla FAT16.
>How-To-Repeat:
This partition was created by Win95 OSR2's fdisk. I formatted it
as a vanilla FAT16.
>Fix:
I used fdisk -u to change the partition ID to 5 (Extended DOS) and
rebooted, and all of a sudden I can mount the /dev/wd0s5 okay.
Win95 seems happy enough with the partition type set this way, but
I do kind of wonder what might go wrong down the road due to this
change.
Eliminate Microsoft.
I will undertake to reasearch the use of partition ID's a bit more
and see if I can come up with a work-around which could go into the
Handbook and/or FAQ.
>Audit-Trail:
>Unformatted:
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