I get these errors when trying to hotsync:

-- Calendar
- Some handheld records were not copied to your PC. Your computer may be full or you may have reached the maximum allowed records on the desktop. To correct this situation, delete some records and perform a HotSync operation again.
Desktop = 20, Handheld = 15
- Some PC records were not copied to the handheld. Your handheld may be full. To correct this situation, delete some records and perform a HotSync operation again.
Desktop = 20, Handheld = 15
Calendar synchronization failed

I have tried dbscan already and botht my pc and handheld have plenty of space. Im using a treo 650. Any help would be appreciated.