TFAT not covered in ExFAT section  It appears ExFAT has a variant known as TFAT  httpmsdnmicrosoftcomenuslibraryaaaspx  There is very brief wikipedia entry at httpenwikipediaorgwikiTransactionSafeFATFileSystem  It would be nice to have a line or two here a pointer to the other article and may be some work on the other article if anyone is up for it   Greg Freemyer