>>>I mistyped. I meant 2 TB drive with 1 TB already used.
>>
>>That's what I suspected. :-)
>>
>>Then the question is: Why do you want to change the format type? Windows supports exFat also, AFAIK. Or have you had any problems with it?
>
>No, I don't have any problems. But I thought that a more reliable format is NTFS. Maybe I should leave it the way it is; unless there is a way to convert without losing any data.
>Thank you.

You know the rule, if it ain't broke... :-)