Adapting IDE to Compact Flash

[LiquidCyanide]

After seeing this site: http://www.aemmenet.ch/Publikationen/CFtoIDEpinout.html and reading about devices to use compact flash cards as boot up devices on the IDE channels of computers I had the bright idea that I could possibly wire up an IDE drive to a CF card and put it in my PDA.
I looked at the pinouts on that site and most of the important IDE signals seem to be accounted for. Other than the obvious problems of the PDA (HP Jornada) recongnizing an IDE device as proper storage (due to size limitation, etc) does any one else see an problems here.
I know I have to figure out a power source, but that is not too difficult. Are there certain important signals that an IDE device might need that CF lacks?

Thanks
Brian

 

[Evadman]

<edit> Nevermind, I am on crack. </edit>

Also, your going to need much more power than the little batteries can put out, but you already know that.

 

[Jarhead]

Some vendors that use Compact Flash do not wire through IOCS16 and also the DMA signals.

In that case, you will be limited to PIO mode, 8 bit transfers, and if I remember right, burst is
affected.

 

[Jarhead]

See sandisk for details:

http://www.sandisk.com/tech/oem_design/cf/Cf_ide.pdf

Ah, there are the DMA signals that you will probably be missing DMACK and DMARQ

 

[LiquidCyanide]

I was thinking there would be some problems with hard drive spin up/spin down. But in an OS like DOS, or on BIOS boot up, a HD is smart enough to hold its own. I still plan on testing this with a small 2.5" drive I have, wish me luck. I'll let everyone know how it goes.