The user does not need to reserve enough space for the update.If the update applies correctly but fails to boot, the system will rollback to the old partition and the user can still use the system as usual.The user will continue on the old version of the system and the system will attempt to apply the update again at a later time. If the update fails to apply, the user is not affected.The update checks happen periodically in the background. The user does not need (although they can) to request for an update.The only downside for users is a required reboot (or, in Chrome OS, a sign out which automatically causes a reboot if an update was performed where the reboot duration is about 10 seconds and is no different than a normal reboot). Updates can happen while the system is running (normally with minimum overhead) without interrupting the user.And reducing the need for flashing devices manually or at repair and warranty centers, etc. Hence, reducing the likelihood of corrupting a device into a non-usable state. Updates maintain a workable system that remains on the disk during and after an update.In contrast to more primitive system updates (like Windows or macOS) where the system is booted into a special mode to override the system partitions with newer updates and may take several minutes or hours, A/B updates have several advantages including but not limited to: System updates in more modern operating systems like Chrome OS and Android are called A/B updates, over-the-air ( OTA) updates, seamless updates, or simply auto updates. Merging from Android (or other code bases).Prefer Not To Implement Your Feature In The Updater Client.
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