When you transfer data stored in a NTFS disk partition to a JetFlash drive that had been formatted to FAT or FAT32, Windows will prompt a "Confirm Stream Loss" error message. This error message is caused by the Thumbs.db file, which is generated by Windows when the partition is NTFS. This issue will not damage the data stored in the JetFlash drive. By deleting the Thumbs.db file before transferring data to the flash drive, the error message will be eliminated.Note: Thumbs.db is a hidden file. To display this file in Windows, please go to Tool→Folder Options→View→Under Hidden files and folders select→Show hidden files and folders.