What's wrong with that? You should still be able to swap...I swap 200k cds all the time...
If you want to add dummy data to your cd to make it easier to swap try something like this:
Disc CDROM PHOENIX.DSK
LeadIn MODE1
PostGap 150
EndTrack
Track MODE1
Pause 150
Volume ISO9660 PHOENIX.DSK
SystemArea "ip.bin"
PrimaryVolume
SystemIdentifier "SEGA SEGASATURN"
VolumeIdentifier "PHOENIX_EMU"
VolumeSetIdentifier "PHOENIX_EMU"
LogicalBlockSize 2048
PublisherIdentifier "SEGA ENTERPRISES, LTD."
DataPreparerIdentifier "SEGA ENTERPRISES, LTD."
ApplicationIdentifier "PHOENIX_EMU"
CopyrightFileIdentifier "CPY.TXT"
AbstractFileIdentifier "ABS.TXT"
BibliographicFileIdentifier "BIB.TXT"
Lpath ; Path tables as specified for Saturn
Mpath
Hierarchy
File 0SL.BIN;1
Source c:\satprog\iso\SL.BIN
EndFile
File ABS.TXT;1
Source c:\satprog\iso\ABS.TXT
EndFile
File BIB.TXT;1
Source c:\satprog\iso\BIB.TXT
EndFile
File CPY.TXT;1
Source c:\satprog\iso\CPY.TXT
EndFile
File DATA.DAT;1
Source c:\satprog\iso\dummydata.dat
EndFile
EndHierarchy
EndPrimaryVolume
EndVolume
PostGap 150
EndTrack
Leadout CDDA
Empty 500
EndTrack
EndDisc
Sl.bin is your compiled code, ip.bin is your country code and other startup stuff, leave the text files alone I think their required, not positive, change data.dat to anything you want, its just dummy data. Also make sure you change the locations in my cti file to point to your files.