Use mkdosfs -I to be able to write to /dev/loop* #418
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From mkdosfs' manual: "It is typical for fixed disk devices to be partitioned so, by default, you are not permitted to create a filesystem across the entire device. mkfs.fat will complain and tell you that it refuses to work." On some systems, mkdosfs identifies the loop device is an entire disk. The -I flag makes mkdosfs work properly on such systems.
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From mkdosfs' manual:
"It is typical for fixed disk devices to be partitioned so, by default,
you are not permitted to create a filesystem across the entire device.
mkfs.fat will complain and tell you that it refuses to work."
On some systems, mkdosfs identifies the loop device is an entire disk.
The -I flag makes mkdosfs work properly on such systems.