Questions about Icy Box Ib-Rd3640su3

Yes, that should not be a problem, normally RAID controllers support the possibility to add drives to the array later. It just takes a while. Here you can find the manual for this product: https://www.raidsonic.de/products/external_cases/soho_raid/index_de.php?we_objectID=935#support

Hello Attention, as Walter has already written. I think it depends on which system you are running it on... But to make a RAID with 4 disks out of 2 disks is, e.g. on a Synology NAS, not so easy... The NAS recognises it as an external drive and not as an internal pool.B on a Synology NAS is not so easy possible... The NAS recognises it as an external drive, and not as an internal pool or like if you connect it as an extension via DX517 for example... So it would be easy possible... But here just my hint, if you connect it to a Syno...

Also works with 3 (equally sized) hard disks.

From my point of view, this is not necessary, because at level 1 you don't hear the fan at all. Only at level 3 is it really audible.

I can't imagine that this works and I can't find a hint in the manual. I assume that the box has its own logic for reporting hard disks as defective and hope that this does not happen at the last minute. But it seems to me that the whole thing is hijacked from the outside.

As far as I understand, this means the connection in the third picture. Since the ICY BOX has USB 3.0, these interfaces can achieve a transfer rate of up to 5 Gbit/s and since older systems do not have USB 3.0 and USB 2.0 would be much too slow, SATA-2 was chosen as the external connection.