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GKC won't have that much more shelflife than a full cart. The only real difference between them is that the GKC will have a tiny capacity, likely in the megabytes, compared to the up to 64gb carts.

The smaller NAND capacity might reduce risk of failure but when we're talking about the cartridges expiring due to age it's not going to be a dramatic difference.

Essentially it is just a cartridge with a very low storage limit.