There are more detailed resources on the web that cover all the ins and outs and potential pitfalls or alternate methods but I will try to keep this a simple and brief description of what worked for me. Your mileage may vary as they say.
First, this is for the original (now out of production) SatanDisk not Ultra Satan.
1. Have an Atari ST with TOS 1.04 or better.
2. Have HDDriver on ST floppy disk.
3. Have a 512mb SD card.
Use a Windows PC to format the SD card as FAT (not FAT 32)
Put the SD card in the SatanDisk and the HDDriver floppy in your ST and boot the ST
Switch to medium resolution if you have a color monitor.
Load HDDRUTIL.APP from the floppy.
On the Hard Disk drop down menu select Partition.
It will tell you a capacity value for your card. Enter a slightly smaller number on line 0 right hand column under heading MiB.
Click on Compatability button then next to where it says Windows check Tos & Windows
Click OK and click through the next few dialogs to complete the partition of the SD
Reboot the ST
Load HDDriver from floppy again
From the File drop down menu select install HD Driver and click OK (or whatever to install the driver on the SD).
From the General drop down menu
Next to Cache for FAT change 10 to 2
Next to Cache for Data change 10 to 2
Next to Additional Folders change 100 to 0
Click OK or whatever it says to accept/save those values
From the File drop down menu select install HD Driver and overwrite the previously installed HD Driver.
Reboot the ST.
If all went well your SD card will look like one large hard drive to ST and Windows will also be able to see it and read / write files on the SD card when you insert it into a PC.
This process worked for an Atari 1040STf with 1MB and TOS upgraded to 1.04. By default HD Driver configures without the ability to transfer files between TOS and Windows and also configures itself some nice fat caches. I assume the author had a higher end ST or a TT or Falcon. Reducing those caches will allow the smaller memory machines to run more programs.
Edited by SIO2, Mon Apr 25, 2016 7:07 PM.