"rom manager" cannot partition the sdcards (although i've never heard of "room manager")
to partition your sd card you need to download the freeware MiniTool Partition on your pc and install it on your pc and format and partition the sd card through it.
follow this instruction step by step...
1.download the file from here-
[App] Link2SD - xda-developers
2.install the app
3.download the partitioning tool from here-
http://download.cnet.com/Partition-W...=dl&tag=button
4.install the above software on you computer
5.now connect the phone via usb to your computer and mount it....
6.start the partition wizard application on your computer
7.select the mounted drive
8.right click on the device and select resize
9.resize your sd card to a suitable limit and leave some unallocated free space
10.now select that unallocated space and right click and selct modify
11.now select the format option of ext3 from the drop down list
12.now come to the home window of th software and on the bottom left side you have an option called apply the pending changes,select that.
13.after the changes have been applied exit the application and then dismount the drive
14.power off the phone and then remove the sd card once and then reinsert it again and restart he phone
15.once you are done with that,start the application link2sd and then you are ready to go....link the application you see to you allocated ext2 partition .....
CAUTION!!!!
1.do not link any system app
2.don't link widgets and home launchers like launcher pro or adw
3.and don't link any antivirus app...
go on enjoy freeing up space in the internal memory
Written by borax12 @ xda-forums