A little while ago I upgraded my setup to a new case with 24 hot swap bays so I could expand my array having reached maximum capacity in my existing case. At the same time, I added a second controller for the number of disks. All good. Everything transferred over smoothly. After making sure it was all behaving properly, I dug out one of my older disks that I had previously replaced with a higher capacity one, popped it in the new array and pre-cleared it. All went well, it passed. Did SMART tests etc everything passed. Today I got some read errors reported off the disk (67 iirc). I appreciate it was a risk to add in an older disk, but there was nothing wrong with it when it was replaced and the preclear/SMART testing all passed - in fact the SMART testing still reports it as passing. What would the best thing be to do with it now? I presume just clear it off, remove it and shrink the array back down. There is only a small amount of data on it (I made sure of that) and none of it is irreplaceable so I'm not worried about the data on it - just a bit loathe to bin a disk (definitely past it's warranty) unless I have to...