Q: Bootcamp partition disappeared

Hi,

I had a standard bootcamp install that was working fine, and then on day it decided to disappear as an available boot drive. Indications are the partition is still there, but I can't mount it. I have not modified the config of the machine (ie. upgraded to 10.8 or messed with the partitions) How can I access the volume so that can at least back it up. I am fully willing to nuke and pave, but I would like to get the data out of windows if at all possible. By way of diagnostics I'm including some data from gdisk in hopes that someone out there can give me some guidance.  TIA

GPT fdisk (gdisk) version 0.8.6

Partition table scan:

  MBR: hybrid

  BSD: not present

  APM: not present

  GPT: present

Found valid GPT with hybrid MBR; using GPT.

Command (? for help): p

Disk /dev/disk0: 976773168 sectors, 465.8 GiB

Logical sector size: 512 bytes

Disk identifier (GUID): 48022333-01F8-486B-95CA-3E0F4905D50C

Partition table holds up to 128 entries

First usable sector is 34, last usable sector is 976773134

Partitions will be aligned on 8-sector boundaries

Total free space is 205 sectors (102.5 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name

   1              40          409639   200.0 MiB   EF00  EFI System Partition

   2          409640       684003367   326.0 GiB   AF00  Macintosh HD

   3       684003368       685272903   619.9 MiB   AB00  Recovery HD

   4       685273088       976773119   139.0 GiB   0700  BOOTCAMP

Hanks-iMac:~ hank$ sudo gpt -r -vv show disk0

gpt show: disk0: mediasize=500107862016; sectorsize=512; blocks=976773168

gpt show: disk0: Suspicious MBR at sector 0

gpt show: disk0: Pri GPT at sector 1

gpt show: disk0: Sec GPT at sector 976773167

      start       size  index  contents

          0          1         MBR

          1          1         Pri GPT header

          2         32         Pri GPT table

         34          6        

         40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

     409640  683593728      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  684003368    1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  685272904        184        

  685273088  291500032      4  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7

  976773120         15        

  976773135         32         Sec GPT table

  976773167          1         Sec GPT header