I used a C400 64GB USB2 Flash Drive EMTEC green to record digital MP4 using a converter of VHS tapes and transferred them to a PC. This has worked very well. But a moment after I deleted one by one all the processed files, I found that by viewing the properties, approximately 2GB of the space remained occupied when no files were reported.
That had already been the case with key 8 or 32GB, because recording ended badly, and in this case I proceeded to reformat to recover all available space.
So I reformatted the default key with exFAT 64B and 32 kilobytes. But since then I can no longer use the key on the converter. As I do not know what the characteristics of this key were before reformatting, I sent a request for information to EMTEC to be able to reproduce the initial format that worked correctly.
But I received no response. I tried to format in FAT32 but can not do it because I have such options as exFAT or NTFS for reformatting the key. Who can help me find my intitial formatting Flash Drive