Sorry for bringing back such an old thread, I debated starting a new one but figured I should keep it all together.
I was just browsing ebay and noticed that the stock hard drives actually have a sticker stating the version as "2.0" and like I said I have a Happ replacement that states the version as "2.01". My original 2.0 HD has the bottom half of the SHOCK sticker torn off so I had never seen the 2.0 sticker.
I just figured I would pass this along so the naming convention in Mame could be corrected.
2.0 would be the version I recently submitted and 2.01 is the chd that was originally supported in Mame. Why the 2.0 drive has a program date later than the 2.01 drive I cannot explain????
Attached is a photo I took off an ebay listing where you can zoom in and see the 2.0 sticker on the stock HD.