It go with no errors but I can't see any difference:
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: fdisk: 1> Disk: /dev/disk1 geometry: 121601/255/63 [1953525168 sectors]
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: Offset: 0 Signature: 0xAA55
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: Starting Ending
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: #: id cyl hd sec - cyl hd sec [ start - size]
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: ------------------------------------------------------------------------
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: 1: EE 1023 254 63 - 1023 254 63 [ 1 - 1953525167] GPT
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: 2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: 3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: 4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: fdisk: 1> Partition 4 marked active.
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: fdisk:*1> Device could not be accessed exclusively.
Sep 21 03:16:24 tomaremac installd[4557]: ./postinstall: A reboot will be needed for changes to take effect. OK? [n] Writing MBR at offset 0.
using this to check:
bash-3.2# fdisk440 -d /dev/rdisk1
1,1953525167,0xEE,-,1023,254,63,1023,254,63
0,0,0x00,-,0,0,0,0,0,0
0,0,0x00,-,0,0,0,0,0,0
0,0,0x00,-,0,0,0,0,0,0
or this from the scripts:
fdisk440 -d /dev/rdisk1 | grep -n "*" | awk -F: '{print $1}'