Maybe the nuvi is not being allocated a drive letter for some reason. Have you checked in Disk Management? Depending on your OS, something like this: Control Panel>Administrative Tools>Computer Management>Disk Management and then see if the 1490 is listed as 'GARMIN' but without a drive letter as in the topmost entries indicated by red arrows in the pic. If it has no letter right click either entry, select 'Change Drive Letters and Paths...' and add a drive letter.
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