I would certainly start creating some tiles for the areas you like to fly the most using the space you have available Bing and ARC are good sources for most areas in the US. Some are happy with ZL16 which uses a lot less disk space, but, with ZL16, I find the immersion drops too much when you get down low. I use ZL17 and set the config to download ZL18 within 3 kms of airports. This results in an average of about 10 GB per tile after deleting the original orthophotos once the tiles are created. The amount of storage will also depend on the resolution you download your orthos at. It will get you started, but I purchased a 5TB external drive for my Ortho tiles. Thanks for the info TurnandBank, i guess my only choice is to dive into it, i only have a 1tb hard drive is this enough for Ortho tiles?
