I have the Samsung LE40C750 3D LCD TV. I connected a WD MyBook 500GB 3.5" USB drive. It is currently FAT formatted, and plays MKVs and photos just fine. I get the same error when trying to format from the TV. The TV was recently firmware upgraded from the internet, but I don't know if it would have worked before this.
The TV was bought in Denmark (Northern Europe), if it matters.
From what I understand this should 'just work'. Are we missing something?
I have a Samsung UE40C7000 3D LED TV and I wish to connect a WD Passport 160G external USB hard drive for recording TV and timeshifting. The hard drive can be connected for playing movies, pictures etc in both NTFS format and FAT32, but when I try to record the TV says the drive needs to be available for recording and needs formatting. After starting the format process using the TV menus, the TV reports the drive cannot be formatted. The operating system used to format the USB hard drive is Windows 7 (to format in FAT32 I used guiformat.exe which is a gui version of FAT32format).
Is it possible to connect an external USB hard drive to perform this function and if so, how is it done?

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