Whiteout

noun

1. A heavy snowstorm; a blizzard.
2. Any weather condition in which visibility and contrast are severely reduced by snow or sand causing the horizon and physical features of the terrain to disappear.
3. Correction fluid (from the brand name Wite-Out).
4. A sporting event where all in attendance are urged to wear white apparel.
5. The simulated erasure of a file, etc. on a read-only volume.