Question Synology RAID Calculator | RAID0 mixed disk capacity

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Question Synology RAID Calculator | RAID0 mixed disk capacity

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Looking to redo my backup NAS as I'm running out of capacity. I have 10TB and 6TB disks which I was going to join in a simple JBOD.

Using the Synology RAID Calculator I noticed that in a RAID0 configuration,

Capacity = 10TB + 6TB = 16TB

I always understood that RAID0 mixed disks yielded ...

Capacity = (number of disks) * (smallest disk)

Does Synology do this differently ( a la SHR), or is their RAID calculator borked?
 
My old Lenovo ix2 NAS [still not dying] is set up with a mismatched 2TB and 1TB. It's doing non-critical Time Machine backups, and radiating heat.

Since the options were RAID1 / RAID 0 / None, I'm guessing 'None' is JBOD as it stores data contiguously vs RAID 0's striping. I don't care either way but I think I opted for JBOD because the disks aren't the same at all and most of the time it will be writing to one disk not both.
 

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