Date: Thu, 28 Nov 2002 23:00:29 +0100 (CET) From: Riccardo Torrini <riccardo@torrini.org> To: freebsd-current@FreeBSD.ORG Subject: Trivial patch: fdisk doesn't recognize my partitions Message-ID: <XFMail.20021128230029.riccardo@torrini.org>
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I have 4 primary partitions and I use a boot manager (magic.com)
that install some black magic that hide unused partition, this
permit to have multiple 'other-OS' partition that don't know of
each other (but, obviously, FreeBSD can see and mount all of them).
As far as I know it use an EXOR 0x10 to hide/unhide but fdisk doesn't
recognize 0x0B/0x0C fat32 when hidden (0x1B/0x1C)
This is the patch, that can be extended easily to cover the range
0x1A-0x1F (0x0A-0x0F when hidden). I simply copied strings from
0x0B/0x0C and added Hidden in front of them :-) Any comment?
(I don't know if 0x1B/0x1C are registered as used)
# cd /usr/src/sbin/fdisk
# diff -u3 fdisk.c.orig fdisk.c
--- fdisk.c.orig Mon Oct 28 14:31:04 2002
+++ fdisk.c Thu Nov 28 22:42:05 2002
@@ -151,6 +151,8 @@
,{0x16, "OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB)"}
,{0x17, "OS/2 BM: hidden IFS (e.g. HPFS)"}
,{0x18, "AST Windows swapfile"}
+ ,{0x1B, "Hidden DOS or Windows 95 with 32 bit FAT"}
+ ,{0x1C, "Hidden DOS or Windows 95 with 32 bit FAT (LBA)"}
,{0x24, "NEC DOS"}
,{0x3C, "PartitionMagic recovery"}
,{0x39, "plan9"}
And yes, when FreeBSD is hidden it become 0xB5, so if you have
multiple FreeBSDprimary partition I think we must add also this:
@@ -195,6 +197,7 @@
,{0xA7, "NeXTSTEP"}
,{0xA9, "NetBSD"}
,{0xAC, "IBM JFS"}
+ ,{0xB5, "Hidden FreeBSD/NetBSD/386BSD"}
,{0xB7, "BSDI BSD/386 file system"}
,{0xB8, "BSDI BSD/386 swap"}
,{0xC1, "DRDOS/sec with 12-bit FAT"}
# fdisk.orig
******* Working on device /dev/ad0 *******
parameters extracted from in-core disklabel are:
cylinders=12592 heads=16 sectors/track=63 (1008 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=12592 heads=16 sectors/track=63 (1008 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 27 (0x1b),(unknown)
start 63, size 1638567 (800 Meg), flag 0
beg: cyl 0/ head 1/ sector 1;
end: cyl 101/ head 254/ sector 63
The data for partition 2 is:
sysid 22 (0x16),(OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB))
start 1638630, size 208845 (101 Meg), flag 0
beg: cyl 102/ head 0/ sector 1;
end: cyl 114/ head 254/ sector 63
The data for partition 3 is:
sysid 27 (0x1b),(unknown)
start 1847475, size 3068415 (1498 Meg), flag 0
beg: cyl 115/ head 0/ sector 1;
end: cyl 305/ head 254/ sector 63
The data for partition 4 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
start 4915890, size 7775460 (3796 Meg), flag 80 (active)
beg: cyl 306/ head 0/ sector 1;
end: cyl 789/ head 254/ sector 63
# ./fdisk
******* Working on device /dev/ad0 *******
parameters extracted from in-core disklabel are:
cylinders=12592 heads=16 sectors/track=63 (1008 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=12592 heads=16 sectors/track=63 (1008 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 27 (0x1b),(Hidden DOS or Windows 95 with 32 bit FAT)
start 63, size 1638567 (800 Meg), flag 0
beg: cyl 0/ head 1/ sector 1;
end: cyl 101/ head 254/ sector 63
The data for partition 2 is:
sysid 22 (0x16),(OS/2 BM: hidden DOS with 16-bit FAT (>= 32MB))
start 1638630, size 208845 (101 Meg), flag 0
beg: cyl 102/ head 0/ sector 1;
end: cyl 114/ head 254/ sector 63
The data for partition 3 is:
sysid 27 (0x1b),(Hidden DOS or Windows 95 with 32 bit FAT)
start 1847475, size 3068415 (1498 Meg), flag 0
beg: cyl 115/ head 0/ sector 1;
end: cyl 305/ head 254/ sector 63
The data for partition 4 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
start 4915890, size 7775460 (3796 Meg), flag 80 (active)
beg: cyl 306/ head 0/ sector 1;
end: cyl 789/ head 254/ sector 63
Riccardo.
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