The first version of pdisk was written in late 1996 when I was a member of the MkLinux team at Apple Computer. Since pdisk provides some functionality that other MacOS partitioners don't, a simplistic port was done to the MacOS, using some generic SCSI access code written by another programmer at Apple.
In January 1997 I got hijacked onto the Rhapsody project. I did a quick initial port to Rhapsody/Darwin/MacOS X and then nothing happened for a while.
In December 1997, I added support for ATA/ATAPI devices to the MacOS version of pdisk. Various other small changes worked in during early 1998 and then it languished for a long time.
In February 2000, I finally got a machine to run LinuxPPC on. I worked on pdisk some and put a distribution together in May. Since then I haven't really done anything with it.
These days I don't even run Linux anymore. I get maybe one email about pdisk a month if that.