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