Sony bluray bdp-s380 and bdp-s485 and HDD format type : FAT32 or exFAT

hello experts...

I really need urgent answer from u guys regarding the files type supported for the above sony bluray players I owned.

I have bought a 500gb external hard disk to store all of my movies inlcuding those with big size i.e. more than 4 gb for the majority of my 3D and 1080p movies collection. I read many forums regarding NTFS, FAT32 and exFAT. For info, i am using the latest macbook air to transfer movies and also sometime using my normal windows XP laptop. So, this is clear that NTFS is out of my option since it is not supported by mac (can read but cannot write)

Therefore, i need you advise regarding which is the best to format my HDD...FAT32 (limited to 4 gb files) or exFAT? More importantly, i need to make sure those movies can be played using the above blurays. Aybode tried playing using the exFat formatted HDD on those bluray? Does it work?

looking forward to hear from u guys soon.

Thanks