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Partition sd card needed if you wanna use program that need a second active sd card to use for internal memory in your smartphone, this method mostly use by Samsung Galaxy Gio, Samsung Galaxy Fit, Samsung Galaxy Young, Samsung Galaxy Mini, and Samsung Galaxy Ace users.
The simple ways to partition your sd card is using Minitool Partition Wizard this tool compatible with Windows 2000/XP/Vista & Windows 7.
Requirement : USB SD Card Reader
Insert SD Card to your usb sd card reader and plug in to your computer, Windows should report a new drive and contents must be visible. Backup sd card cause partition will erase all your data.
Step 1 : Delete old partition
Note : When you using minitool partition wizard there is QUEUES operation, so nothing will happen until you click APPLY and then confirm by click YES.
As you can see in images show below, Disk 3 is SD CARD, just right click it and select delete.
this is where you save your data, so maybe you need this drive in bigger volume than the second one. when you have SD CARD less than 2 GB select FAT but when you have 4GB or bigger select FAT32.