Save has never seemed to work - we've got an A1200T that has a FASTATA - here is the procedure that you need to follow every time you make changes to your hard disk in HDToolbox
1. Open Prefs
2. Double click on ATA3Prefs
3. Change drive to NOSPLIT
4. Click USE *** NOT SAVE ***
5. Goto Tools drawer and open HDToolbox
Always do this every time before you make any changes to your hard disk.
The rule is if you originally prepped your hard disk in NOSPLIT mode - always change to NOSPLIT mode before repartioning etc by using the procedure above.
Disclaimer: we cannot be held liable for any consequential loss or data loss by following the advice.