![]() Insert the connector cable in to the new hard drive. Replace and tighten the T6 Trox screws in to the new hard drive. There are two screws on either side of the hard drive. Remove four T6 Trox screws from the hard drive, as shown in Figure 50-7. ![]() They may not secure-erase a HDD Mac going to refurb because of the time it takes. Remove the connector cable from the hard drive by pulling it straight out, as shown below. I don't know if all Apple computers with HDD's at that time were Core Storage-formatted or if the previous owner encrypted the drive and simply erased it. I just recently noticed that the HDD that came out of that computer (swapped out immediately for a SSD) used Core Storage. The refurb Mac with HDD's may be different. I would suspect if they didn't, we'd have seen an exposé to that effect by now. I'm sure that the SSD vendors that Apple uses has implemented it (there's only a few manufacturers of NAND chips and controllers of the sort that Apple uses). ![]() ![]() To do a complete secure erase on a SSD is much quicker (Micron says it takes less than a minute on most of their SSD's and they don't sell PCIe NVMe SSD's) than on HDD's because of the technology and the ability to parallelize - something you can't do on HDD's - this is the case if the SSD manufacturer has implemented it properly and the software that Apple uses it utilizes the proper commands and does the secure erase prior to selling a refurb. ![]()
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