It is is a 4TB USB drive. I formatted it in Windows and used GPT dynamic disk so I can have 1TB & 2TB NTFS partitions, and then also a 1TB FAT32 partition for ps3 games. Like an idiot I filled it almost completely with data before plugging it into my ps3 thinking the FAT32 partition would "just work" but it not detected. I can't even get the drive to show up at all, even using the NTFS option in mmCm. I'm thinking I might just have to start all over and let the ps3 do the formatting, but not sure how that will work with the drive being 4TB and FAT32 has 2TB limit. Also, is there a way around the 4GB file limit in windows? I know it is possible to put files >4GB on FAT32 because this works when sending files over FTP from NTFS on PC to FAT32 on PS3 thru an ethernet cable. Thing is, that usually caps out around 15-20MB/s speed and if I could do it natively in Windows I'd be looking at more like 100-150MB/s speeds.