cannot be converted because it contains files or directories with reserved NTFS names in the root directory. There can be ...

%1 cannot be converted because it contains files or directories
with reserved NTFS names in the root directory. There can be no
files or directories named $Mft, $MftMirr, $LogFile, $Volume,
$AttrDef, $BitMap, $Boot, $BadClus, $Secure, $UpCase, $Extend
or $Quota in the root directory.