In general if the devices you need to copy files between all support exFAT or NTFS they're probably a better bet than FAT32, but as of 2013 support for FAT32 is likely to be both more common and more bulletproof in non-PC devices that either exFAT or NTFS. With a 3TB drive the FATs will be 349MB which will take ~10-20 seconds to read over USB 2.0, though you won't notice much delay over USB 3.0 That's not to say that using FAT32 on such a large device is necessarily a good idea - Windows will take some seconds to mount it because it seems like it reads one or both of the FATs as part of the mounting process. The picture shows a WD My Book 3TB External Hard Drive. However some(all?) >2TB external drives use 4K sectors. With 512 byte sectors that means a 2TB drive. It issues a FSCTL_ALLOW_EXTENDED_DASD_IO which experimentally seems to fix a strange problem (Windows bug?) where all the writes succeed but nothing actually changes on disk.įAT32 is limited to 2^32 sectors. It also has a fix for making drives bootable using bootsect.exe from the Windows AIK, aka Windows PE. The latest version has support for GPT drives.
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