I don't expect they will be lost. I expect they will stay. NTFS also supports hidden file.
But if you've got any doubts, why not copy them to another drive first? Then you can copy them back if needed.
Okay, so I've got the Windows 7 Beta Boot Disk.
But I don't want to install it on my Main HDD (XP SP3 + W7B = Custom. Custom is not going to be fun on my primary). Partitioning my Main HDD is going to not work (Windows XP SP3 is on there).
So I decided to use my XHDD. It's a WD Elements Portable 120GB, It's FAT32 and I need it to be NTFS before W7B can go on there. So here it is we come to my problem.
There are two Hidden files, clocking in at an aggregate of 274MB. Should I continue to convert, those files will be lost for good?