8051 floppy sd
To be honest, I think you should rethink your storage...
1) Floppy disks are notoriously unreliable, certainly
not permanent
2) The interface is very tricky
Basically, the interface required a 500kbps, with weird timing to get the data directly onto the disk surface as it spins. It is not like writing to a hard disk, where you just send data and the drive's electronics takes care of writing it. I have never come across a good solution to this.
It would probably end up cheaper to work a solution with CF or SD card memory, for which off-the-shelf commercial and DIY solutions can be easily found on the 'net.
However, here are some links to the floppy interface:
http://ohlandl.kev009.com/floppy/Floppy_Pinouts.html
**broken link removed**
Your only hope, I think, and it is a
very small one, would be to locate an old floppy controller chip i a very old computer and salvage it. Then find the datasheet for it. etc, etc. As far as I know, these are not in manufacture any more as the floppy control is integrated with everything else in a PC.
Just a thought, do you need to actually remove the storage device? You son't say so. If not, it would be cheapest to just put in some big flash chips!
Cheers,
FoxyRick.