thanks for the info, but that not what i mean, on my old bravia KD-43X7500E can detect all of kind of external drive (1TB HDD or any ufd) & in any format (NTFS, FAT32, even EXFAT)
what i don't understand why on newer model KD-55X7500H can't detect any of theose (only FAT32), but what the use of FAT32 if it use on 1TB drive
Sorry, haven't been checking in for a while! Remember that the Bravia works with external storage in two ways. The first is as traditional removable storage. According to the specs, your KD-55X7500H should be able to recognize a USB drive formatted as FAT32 or NTFS only. If it isn't recognizing the more useful NTFS format, the drive might be formatted in some odd manner (like using a nonstandard cluster size). Formatting on a Windows machine running anything more recent than Windows 2000 or NT 4.0, using the default settings, should work. If not, check the port you've plugged into—some USB storage doesn't play nicely unless it's in a USB 3.0 port (and rarely, it prefers USB 2.0). The specs don't say, but given the manufacturing year, I'd guess your two ports are both USB 3.0. Be sure to try your drive in both. Of course, make sure you have proper independent power supplied to the drive. The Bravia has powered USB ports, but its output might not be sufficient for a power-hungry external drive.
The other way the Bravia uses removable storage is to pair it to the Bravia as "internal storage". This formats the drive using the Bravia itself, and locks it so that the drive can only be used with the Bravia which formatted it. The advantage here is that you can now move apps and files stored on the television's storage to the drive, and vice-versa. This is what I do with my X700D, and apart from a known issue where the Bravia occasionally "forgets" external USB storage, it works quite nicely. (That issue, incidentally, is resolved by a simple reboot. Recent firmwares have all but eliminated the problem.) I keep a file manager and a very lightweight FTP server on the television storage so I can readily troubleshoot and transfer files. All other applications are moved over to my flash drive where they have plenty of room to operate and can be maintained more easily.
From what you've said, I'd certainly look at the format of the drive. Unless you
really know what you're doing, just let a recent version of Windows format it using default settings. No command line or Power Shell tinkering, no disk/partition utilities—just plug it in, right-click on it in Explorer, and Format.
Good luck!