I have three of these. I can format them with either the 1.00 Utility disc (JP region) or the Broadband Navigator disc, whatever your preference may be. Then you just attach it to your SCPH-30000-SCPH-50000 series console and that is it. I can make a region free isntall too if required, so that you can boot the OSD in any region machine.
You could also put this inside the SCPH-20400 or DTL-H20400 external enclosure and it would work the same way, although you would need a memory card formatted with one of the discs to include the HDD driver if you wanted to do this, as the older consoles did not have this included in ROM. I could include this for an extra £3 if required.
The price is £26 plus shiping cost each. I am located in the UK and so are the drives, but I can ship internationally, and it should not cost much more. I can upload some photographs if requested to.