Re: Help! I can't boot my Windows partition any more!

[Andy Ruhl <acruhl%gmail.com@localhost>]

On Wed, Sep 30, 2015 at 3:47 PM, Ottavio Caruso
<ottavio2006-netbsd%yahoo.com@localhost> wrote:
> Hello,
>
> I used to dual boot Windows 7 and NetBSD.
>
> This is my fdisk:
>
>
> Disk: /dev/rwd0d
> NetBSD disklabel disk geometry:
> cylinders: 155061, heads: 16, sectors/track: 63 (1008 sectors/cylinder)
> total sectors: 156301488, bytes/sector: 512
>
> BIOS disk geometry:
> cylinders: 1023, heads: 240, sectors/track: 63 (15120 sectors/cylinder)
> total sectors: 156301488
>
> Partitions aligned to 2048 sector boundaries, offset 2048
>
> Partition table:
> 0: NTFS, OS/2 HPFS, QNX2 or Advanced UNIX (sysid 7)
>     start 2048, size 204800 (100 MB, Cyls 0-13/163/19)
> 1: NTFS, OS/2 HPFS, QNX2 or Advanced UNIX (sysid 7)
>     start 206848, size 63375360 (30945 MB, Cyls 13/163/20-4205/41/25)
> 2: NetBSD (sysid 169)
>     start 63582208, size 46360576 (22637 MB, Cyls 4205/41/26-7271/83/35), Active
> 3: Primary DOS with 32 bit FAT (sysid 11)
>     start 109942784, size 46358528 (22636 MB, Cyls 7271/83/36-10337/93/13)
> First active partition: 2
> Drive serial number: 4067601000 (0xf272aa68)
>
>
> and this is my disklabel:
>
> -- bash-4.3$ sudo disklabel wd0
> # /dev/rwd0d:
> type: unknown
> disk: HITACHI HTS5425
> label:
> flags:
> bytes/sector: 512
> sectors/track: 63
> tracks/cylinder: 16
> sectors/cylinder: 1008
> cylinders: 155061
> total sectors: 156301488
> rpm: 3600
> interleave: 1
> trackskew: 0
> cylinderskew: 0
> headswitch: 0           # microseconds
> track-to-track seek: 0  # microseconds
> drivedata: 0
>
> 16 partitions:
> #        size    offset     fstype [fsize bsize cpg/sgs]
>  a:  17687376  63582208     4.2BSD   2048 16384     0  # (Cyl.  63077*-  80624*)
>  b:    204800      2048       NTFS                     # (Cyl.      2*-    205*)
>  c:  46360576  63582208     unused      0     0        # (Cyl.  63077*- 109070*)
>  d: 156301488         0     unused      0     0        # (Cyl.      0 - 155060)
>  e:  28673200  81269584     4.2BSD   2048 16384     0  # (Cyl.  80624*- 109070*)
>  f:  63375360    206848       NTFS                     # (Cyl.    205*-  63077*)
>  g:  46358528 109942784      MSDOS                     # (Cyl. 109070*- 155060*)
>
>
> I marked my NetBSD partition active with SystemRescueCD, leaving me
> the only option to boot Windows from a usb drive with syslinux.
>
> Now the usb drive is unbootable, therefore I can only access NetBSD.
>
> How can I boot from Windows without recurring to an external computer?

It's been a while since I've messed with NetBSD on a PC, so I might
not be the best guy for this.

Sounds like your primary boot loader, the mbr loader, is missing? It
should prompt you to use an F key to load whatever primary partition
you want. Is it doing that? See the man page for mbr. You can probably
write it back to the MBR inside NetBSD and get the primary bootloader
back.

Andy