Wiktionary
vb. (context transitive computing English) To remove the mapping of (a device, etc.).
Wikipedia
Unmap is the debut studio album by the indie rock band Volcano Choir. It was recorded in the fall of 2008 in Fall Creek, Wisconsin and released on September 22, 2009 on Jagjaguwar. The album reached #92 on the Billboard 200.
The album was reissued on April 7, 2015 exclusively through Newbury Comics. A limit of 500 vinyl copies were to be pressed but a communication error with the manufacturer led to an extra 250 copies of the reissue, amounting to a limited supply of 750 vinyl copies. Stickers attached to the album citing the 500-copy release were covered by new stickers citing the run of 750.
Usage examples of "unmap".
We carried tents and groundsheets and sleeping-bags and saucepans and food and axes and everything else one needs in the interior of an unmapped, uninhabitable and inhospitable country.
And after that invasion was repelled the Empire had steadily grown by exploring and colonizing the wild, unmapped star-systems in the frontier regions called the Marches of Outer Space.
Men of your brigade, General, discovered an unmapped ford and were intelligent enough to obey my orders.
Robin and Evelyn inhabited unmapped regions to my left, along with kitchens by the square mile and, in its furthest reaches, the big room which had been allotted to Kris.
To hear it aright you must stand in the darkness of such a by-street as this, and for the moment be at one with those who dwell around, in the blear-eyed houses, in the dim burrows of poverty, in the unmapped haunts of the semi-human.
They were cold because they had crossed an unmapped boundary to which they would never return.