Recovering a UFS partition in deleted slice

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kalda341

I have accidently overwritten my MBR with

fdisk -BI /dev/ada1

and am unable to recover the data. Does anyone know any way to search the disk for the UFS partition and mount it?
Any help would be greatly appreciated.
Thanks.
 
Okay, my plan is to do something like

hexdump /dev/ada1 | grep $magicnumber

but first I need to know what the UFS magic number is. I can't seem to find it anywhere.
 
Code: 
00364 #define       FS_UFS1_MAGIC 0x011954      /* UFS1 fast filesystem magic number */
00365 #define       FS_UFS2_MAGIC 0x19540119    /* UFS2 fast filesystem magic number */
00366 #define       FS_BAD_MAGIC  0x19960408    /* UFS incomplete newfs magic number */

Update. I have the magic number which I extracted from the UFS source code. I am currently running

hexdump /dev/ada1 -s 300000000000 | grep -w '1954' > output

to try and search for it. The -s 300000000000 is because I know it lies at least 300GB into the drive. The reason I have only searched for half the magic number is that I don't know for sure that both halves will end up on the line. Assuming I find it, does anyone know how I'd then mount it?
 
I've found the magic number:

1c4eeb0a0 1954 0119 0a46 5550 7026 4a05 1082 8808

So I can add the bytes I've skipped and I have the address of the filesystem. Now, how do I mount it?
 
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