
The Final Shape, the upcoming expansion for Destiny 2, requires a significant amount of storage space on various devices. Here are the final install sizes and the required storage space for pre-load on different platforms:
PlayStation 5:
PlayStation 4:
Xbox One:
Xbox Series X/S:
Steam:
Epic Games Store:
Microsoft Store:
Please note that Steam and Epic Games Store download two copies of the game for preload, which is why the storage space required for pre-load is significantly larger on these platforms.

The 25-hour downtime announced for Destiny 2 before the launch of The Final Shape is significant because it allows Bungie, the game's developer, to perform maintenance and prepare the game's servers for the new expansion. During this time, players will be unable to access the game, and the servers will be taken offline. This downtime is crucial for ensuring a smooth launch and minimizing potential technical issues that could arise when the expansion goes live. It also provides an opportunity for players to pre-load the expansion, which can help reduce wait times and server strain on the actual release day.

Steam and Epic Games Store require significantly more storage space for pre-loading compared to the final install size due to the way they handle updates and game versions. During the pre-load phase, these platforms essentially download two copies of the game - the new version and the old version. This is done to ensure a seamless transition between the versions and to allow for a rollback to the previous version if needed.
Once the pre-load is complete and the game is updated to the new version, the old version is no longer needed and can be deleted, freeing up the additional storage space. This is why the storage space required for pre-load is larger than the final install size.
It's worth noting that players with limited storage space can choose to wait until the actual launch and download only the new version of the game, avoiding the need for additional storage during the pre-load phase6.