Hey guys,
thanks for all the tremendous help and hints here. I'm able to set up my PBO to download to the internal HDD via Transmission. However, whenever I reboot the PBO box, seems all the content under /tmp/hdd/volumes/HDD1 are gone!
anyone know why?
I downgraded to P02 then applied mega pack p61. Somehow HDD1 is not mounted?
running mount and fdisk gives this:

/tmp/hdd/volumes/HDD1 # mount
/dev/root on / type yaffs2 (ro,noatime)
none on /dev type devfs (rw)
none on /proc type proc (rw,nodiratime)
devpts on /dev/pts type devpts (rw)
none on /sys type sysfs (rw)
none on /tmp type ramfs (rw)
/dev/mtdblock/2 on /usr/local/etc type yaffs (rw,noatime)
/dev/rd/0 on /mnt/rd type vfat (rw,nodiratime,fmask=0022,dmask=0022,codepage=cp4
37,iocharset=iso8859-1)

/tmp/hdd/volumes/HDD1 # fdisk -l

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 2 9617 77240520 7 HPFS/NTFS
/dev/sda2 9618 9637 160650 82 Linux swap
/dev/sda3 9638 9705 546210 83 Linux

I assume /tmp/hdd/volumes/HDD1 is auto mounted? do I need to mount it explictly?
any help is appreciated.