Using 3.5" HD drives on CP/M systems

I have tried to get a quorum on comp.os.cpm but there are only a few with any opinions. We all agree that 3.5" drives are a viable way to go. Many prefer to never change from 8" drives. I am running the SuperIO (www.imsai.net), it is a new Imsai card and uses a PC controller. I have a variety of CP/M systems with a variety of storage mediums. The point is for those of us that use 3.5" HD drives should try and come to a consensus for a "standardized" format. Questions such as sector size and numbering come to mind. With more PC's dropping 3.5" drives does that mean there will be a limit to new drives all together? Are USB drives a reasonable option. I've been using Flash ROM cards (on both my SuperIO system and coming up now on my eZ80 Acclaim) and I am hoping to come up with a scheme for sharing data with PC's. I like Flash cards since digital cameras should help support continue on PC's. I'm also looking into IDE based CD/DVD drives but they are a one way road since I do not believe CP/M systems will ever write them. I am trying to build a quorum of technically minded CP/M users to try and develop a semi-standard and other ideas. Randy