![]() They may not secure-erase a HDD Mac going to refurb because of the time it takes. 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. SSD 1TB PCIe NVMe Gen3x4 3D TLC NAND Flash Hard Drive Disk Upgrade for MacBook Pro Retina Late 2013-Mid 2015, MacBook Air Mid 2013-2017, iMac Late 2013-2017, Mac Pro 2013, Mac Mini 2014 4. 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). MICROFROM 1TB F11N M.2 SSD NVME PCIe SSD Internal Solid State Drive PCIe Gen3X4, M.2 NVMe 1.3, SSD M.2 TLC NAND Flash Up to Read/Write 2,150/1,800MB/s for PC Gaming Laptop. Step 3: Select the system drive from the sidebar. ![]() Step 2: Select Disk Utility from the macOS Utilities menu. ![]() 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. Step 1: Boot your Mac to macOS Recovery mode: hold down Command + R keys immediately after pressing the power button to turn on your Mac, release the keys until you see the Apple logo.
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