I have the same machine as OP (HP DC7800) and found this post via Google. Unfortunately I haven't been able to apply the gdisk fix successfully.
Exactly what parameters should be used when creating the hybrid partition? E.g. should both original partitions be included, and how should the bootable flag be set on them?
Every parameter combination I have tried so far results in an unbootable drive. :(
This is the partition scheme of my USB stick:
Note the "*" is the bootable flag
Under OSX Terminal:
Code:
bash-3.2# diskutil list /dev/disk4 #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *8.0 GB disk4 1: 0xEE 16.9 KB disk4s1 2: 0xEF 524.3 KB disk4s2 3: FreeBSD 8.0 GB disk4s3 4: 0xEE 20.5 KB disk4s4
Under Gdisk:
Code:
bash-3.2# gdisk /dev/disk4 GPT fdisk (gdisk) version 0.8.10 Partition table scan: MBR: hybrid BSD: not present APM: not present GPT: present Found valid GPT with hybrid MBR; using GPT. Command (? for help): r Recovery/transformation command (? for help): o Disk size is 15605760 sectors (7.4 GiB) MBR disk identifier: 0x00000000 MBR partitions: Number Boot Start Sector End Sector Status Code 1 1 33 primary 0xEE 2 * 34 1057 primary 0xEF 3 * 1064 15605719 primary 0xA5 4 15605720 15605759 primary 0xEE
PS: You have to hybrid your partition table on your USB stick AFTER having installing Freenas on it