First of all, I didn’t know it’s a mistake to buy Apple products on Amazon. This product has taught me never to make that mistake again.Immediate problem was the alerts that the disk was full. I got a terabyte of memory. It didn’t make sense.Called Apple and discovered that a) this was refurbished (a fact I missed when ordering... my fault), b) it was out of warranty, and c) the seller had wiped the computer, but had separated the Mac storage from the tb storage instead of keeping it fused .  The Apple rep I spoke with said he recommend we return the computer and spend the couple extra hundred dollars on a NEW computer from a reputable Apple distributor (like Best Buy).I’m grateful that we discovered this flaw on day one and returned It within hours of receipt. I have placed an order for my NEW iMac at Best Buy!  This whole experience was terribly disappointing.