You can use a comercial partition management tool under Windows to convert the disk or backup your data, reformat as FAT 32 then restore your data.
Unfortunately Microsoft has choosen to limit creation of FAT32 partitions to 32 GB in Windows XP and newer. You can download any of several available utilities to create on Windows or use your Linux platform to format.
My suggestion is to backup the data, use your Linux system to format FAT32 and then restore the data. Ensures the Linux host can read the disk.
Note: There are NTFS file system drivers for Linux. Many are read only though.