Running this cmd line:
format T: /fs:UDF /r:2.50 /v:RAMTEST2d50
Getting these results:
For UDF 2.01
Disk Letter: R:
Size (MB): 1024
File System: UDF
For UDF 2.50
Disk Letter: U:
Size (MB): 1024
File System: RAW

I am using Windows 8. Is there some sort of UDF filesystem detection bug?