Hi, sorry but you can't !
Why ?
Because old 720/880ko got 'larger' head, given them reliability, and it was also due to bad discs heavily spread on the market at that time....
Actuel HD FDD got thiner head to put twice the amount of datas.
My personnal solution :
Look at the thread about the A3000 FDD (i give my nice trick to relive lots of drives).
On my A1200GREX, I use a modern Panasonic HD FDD for DF0: but i have a good Citizen 42C (it cames from an external fdd box) for DF1:
Why that ?
Because the Panasonic is highly sensitive to 'dying' or 'bad quality disc', so when i got when of theses disc, i put it on my Citizen who read it easily :idea:
So I can make a backup on a new fresh disc who will work everywere and for a longtime (I hope).
And if it's worth than that, I have my A1k and it's wonderfull drive ;-)