> I have a 1Tbyte usb external HD that I want to be
> able to read with windows and b134. I have tried all
> of the below but am unable to get solaris to read and
> write to it.
> 
> mkfs -F pcfs -o fat=32 /dev/rdsk/c10t0d0p1
>       *Bad Sig on master boot record!

The following commands would emulate creating
a 1TB (marketing TB) pcfs filesystem on a lofi device:

# mkfile -n 1953125000b /var/tmp/1tb

# lofiadm -a /var/tmp/1tb
/dev/lofi/1

# fdisk /dev/rlofi/1

-> 1    Create a partition
-> D=FAT32LBA
-> 100
-> 6    Exit (update disk configuration and exit)

# fdisk -R -W - /dev/rlofi/1

* /dev/rlofi/1 default fdisk table
* Dimensions:
*    512 bytes/sector
*   44445 sectors/track
*      1 tracks/cylinder
*   43944 cylinders
...
*
* Id    Act  Bhead  Bsect  Bcyl    Ehead  Esect  Ecyl    Rsect      Numsect
  12    128  195    31     2       254    63     1023    44445      1953046635
  0     0    0      0      0       0      0      0       0          0
  0     0    0      0      0       0      0      0       0          0
  0     0    0      0      0       0      0      0       0          0

# mkfs -F pcfs -o fat=32 /dev/rlofi/1:c
Construct a new FAT file system on /dev/rlofi/1:c: (y/n)? y

# mount -F pcfs /dev/lofi/1:c /mnt

# df -h /mnt
Filesystem             size   used  avail capacity  Mounted on
/dev/lofi/1:c          931G    64K   931G     1%    /mnt
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