I am trying to back up about 250GB into 1T Flash Drive. I tried multiple flash drives and I constantly get the same error:
But I am not moving it to my Windows disk. And I am certain I have enough space on the drive. I also tried changing the flash drive type to NTFS and exfat. How can I solve this, and why does it occur? I tried checking checking out multiple similar questions such as: Why a "Not enough space on disk" error on 7zip even with sufficient space? But that didn't help
Perhaps the OS, Windows, is trying to open archives, such as ISO or ZIP files, to transfer contents item-by-item to the USB flash drive. If that is the case, do not open the archive and drag files separately to the other drive, but drag the whole archive, instead.
You might also try the much more robust robocopy utility built into Windows. robocopy can be faster and more reliable than drag-and-drop in Explorer or using the copy command.
BTW, before doing anything else, use diskmgmt.msc or a third-party tool, such as free DiskGenius to check that the USB flash drive is correctly partitioned for your use. Likely, it should have one partition of ~1 TB (manufacturers do tend to over-state the actual size, but even 300 GB would be sufficient). If the drive has been formatted with multiple partitions, remove all partitions, then create a single partition for all free space, and then format it exFAT, to allow ISO files greater than 4 GB to be copied.
