Is it possible to use the entire storage space of both disks or is one always only intended as a "backup"? Since I mainly want to use media / films with it, a failure would not be soooo dramatic. So could I also use the whole 8 TB for media with 2x 4 TB?

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You can also use the 2x 4TB as 1x 8TB. It is entirely up to you how you set this up, e.g. as a JBOD. https://kb.synology.com/de-de/DSM/help/DSM/StorageManager/storage_pool_what_is_raid?version=7

Your data. Your choice.

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Question about Synology DS220j

Is it possible to use the entire storage space of both disks or is one always only intended as a "backup"? Since I mainly want to use media / films with it, a failure would not be soooo dramatic. So could I also use the whole 8 TB for media with 2x 4 TB?