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Forum Discussion
ReadyNAS Ultra 4 with 4TB
I have the ReadyNAS Ultra 4, have been running 2x2TB for 3 years, and I recently threw in a 4TB drive in slot 3 (HGST Ultrastar 7K4000 HUS724040ALE640). It recognized fine and did the expansion, howe...
The key idea here is that the 8 TiB limit applies to the volume size, not the raw disk sizes. You will end up with an ~8TB volume, so you can't exceed the 8 TiB growth limit no matter where you started from.
Assuming you actually did start with 2 x 2TB, you are growing ~6TB in this step. So you could replace one of the 2 TB drives with a 4 TB model in the future, but that is as far as you can take it.
Disk manufacturers use power-of-10 units (1 000 000 000 000 bytes = 1 TB). Windows and many other software platforms (including the ultra) use power-of-2 units (1 099 511 627 776 bytes = 1 TiB). mdgm is using TiB in his post, which is why the numbers might be a bit smaller than you expect.
Assuming you actually did start with 2 x 2TB, you are growing ~6TB in this step. So you could replace one of the 2 TB drives with a 4 TB model in the future, but that is as far as you can take it.
Disk manufacturers use power-of-10 units (1 000 000 000 000 bytes = 1 TB). Windows and many other software platforms (including the ultra) use power-of-2 units (1 099 511 627 776 bytes = 1 TiB). mdgm is using TiB in his post, which is why the numbers might be a bit smaller than you expect.
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