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Question: How to reuse old drives?
(alien.top)
What you're looking for is called "JBOD enclosure" (JBOD stands for "just a bunch of disks")... Be sure to get a SATA one; there are also ones that work with SAS drives... Once you have an enclosure with some drives in it, you can connect it to a NAS server via USB or, hardware permitting, Thunderbolt.