need help

[Michael S]

Hi.

I am relatively new to FreeBSD, have been running it since 5.1.
Nothing like what I experienced today had happened previously.
My machine crashed and I wasn't able to boot it back, the boot
processes wasn't able to find the kernel. I then booted with the 6.0
Release CD and went into the FIXIT mode.
I wasn't able to mount /dev/ad0s1a (I have an IDE drive), I then tried
fsck_ffs /dev/ad0s1 and the message was:
CAN'T READ BLCK 128
ioctl Inappropriate ioctl for device
fsck_ffs: /dev/ad0s1 can't read disk label.

That machine was 6.0 p-1 (patched once) with slightly modified kernel.

Is my data lost? Can anything be done still?
Any help would be appreciated.

Michael