Jacob runs Windows 10 and uses a 2TB USB external drive for backup. He can either do an image that restores file by file or the entire drive. But it doesn't work to restore with all hard drives. What gives? Leo says that there are some drives that combine two drives into one. But they are fewer and farther between now, as 2TB drives are more readily available. Plus, operating systems are now 64 bit, so it's easier to keep track of larger file sizes. In reality, it shouldn't matter. Windows should just read them. Formatting is key, so make sure to use NTFS and MBR as a boot format. Some may be improperly formatted with an older format like FAT32.