Steve Bellovin wrote:

> I have NetBSD 1.5R running on a machine.  However, I made the mistake 
> of installing the Evil OS from Redmond in another partition -- which 
> overwrote the boot selector, so that it only boots you-know-what.  How 
> do I restore the boot selector?  I've tried 'fdisk -B' and 'fdisk -i', 
> to no avail.  (Both of those were done after booting from the cd, using 
> 'boot wd0a:netbsd', and running the commands in single-user with all 
> file systems mounted read-only.)
> 
> While I'm at it -- what changes should I make to my disk label to be 
> able to mount the Windows partition?  Here's what I know of the disk:
> 
> # fdisk; disklabel wd0
> NetBSD disklabel disk geometry:
> cylinders: 16383 heads: 16 sectors/track: 63 (1008 sectors/cylinder)
> 
> BIOS disk geometry:
> cylinders: 1024 heads: 255 sectors/track: 63 (16065 sectors/cylinder)
> 
> Partition table:
> 0: sysid 12 (Primary DOS with 32 bit FAT - LBA)
>     start 1024, size 25175792 (12292 MB), flag 0x80
>         beg: cylinder    0, head  16, sector 17
>         end: cylinder 1023, head 254, sector 63
> 1: sysid 169 (NetBSD)
>     start 25176816, size 124959744 (61015 MB), flag 0x0
>         beg: cylinder 1023, head 254, sector 63
>         end: cylinder 1023, head 254, sector 63
> 2: <UNUSED>
> 3: <UNUSED>
> # /dev/rwd0d:
> type: unknown
> disk: NetBSD
> label: 
> flags:
> bytes/sector: 512
> sectors/track: 63
> tracks/cylinder: 16
> sectors/cylinder: 1008
> cylinders: 16383
> total sectors: 150136560
> rpm: 3600
> interleave: 1
> trackskew: 0
> cylinderskew: 0
> headswitch: 0           # microseconds
> track-to-track seek: 0  # microseconds
> drivedata: 0 
> 
> 8 partitions:
> #        size   offset     fstype   [fsize bsize cpg/sgs]
>   a:  1091664 25176816     4.2BSD     1024  8192    16   # (Cyl. 24977 - 26059)
>   b:  2098656 26268480       swap                        # (Cyl. 26060 - 28141)
>   c: 124959744 25176816     unused        0     0         # (Cyl. 24977 - 148944)
>   d: 150136560        0     unused        0     0         # (Cyl.    0 - 148944)
>   e: 121769424 28367136     4.2BSD     1024  8192    16   # (Cyl. 28142 - 148944)
    f:	25175792     1024      MSDOS

Just adding the above line would be enough.

Rules to add a partition to your disklabel entries:

1. 'start' in fdisk is 'offset' in disklabel (this is somewhat confusing 
and should be fixed, IMHO). size to size.
2. fstype 4.2BSD and MSDOS must be in capital letters. This means msdos 
doesn't work.
3. You don't need to specify fsize/bsize/cpg/sgs with MSDOS entry.
4. See disklabel(5) for available fstypes (I wonder why 'Linux Ext2' is 
on the list, not just 'ext2fs' - this should be also fixed)

Jun-Young