What filing system does the Sony Bravia TV use to format an external Hard Drive?

December 22, 2013
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When I connect an HDD to my Bravia TV USB recording port it formats the drive, and I then make an off air recording. When I subsequently plug that HDD to my PC/laptop it thinks the drive is unformatted and asks if I want to proceed to format it. Consequently I can’t save any files on another drive/system.
Conversely If I let the PC/laptop preceed to format the drive (FAT32 or NTFS) and remove it back to the TV the TV then wants to reformat it.
So my question is what filing system is the TV employing to format the drive?

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