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The 4.59 GB Internal storage are storage partitions, which are only available to applications on the device.
The 1GB Internal storage is a storage area, that appears as a built in SD card and is accessible from a PC via USB (that's why Google usually calls this one "external" storage).
The terminology is confusing, because "internal/external storage" sometimes refers to the physical location (internal = built in, external=sd card slot),
but often is referred to the accessibility (internal = accessible for OS and apps only, external=accessible via USB).