RIM has licensed the exFAT file system from Microsoft. This will enable BlackBerry devices to handle files larger than 4GB.
exFAT (Extended File Allocation Table) was designed by Microsoft specifically for flash drives, including memory sticks and SD cards. It offers compatibility between flash drives and the file systems found on Windows and OSX.
I have a 4GB HP USB flash drive that I had written a Chromium OS image to with Win32DiskImager. Now I am trying to reformat it but I can't. Everything tells me the disk is write protected. Being a USB flash drive, there is no write-protect switch. I have tried the standard windows format thing, disk management, diskpart and HP USB Disk Storage Format Tool. I also tried the registry modification.