Just make sure you know the model of your MacBook Air, as there. They may not secure-erase a HDD Mac going to refurb because of the time it takes. There are reputable websites that specialize in Apple laptop components and they offer replacement SSDs in various capacities.
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. Fortunately, there are plenty of ways to upgrade your MacBook Pros storage capacity with a new internal hard drive.
I just recently noticed that the HDD that came out of that computer (swapped out immediately for a SSD) used Core Storage. But before you crack the hood and start mucking about, pause for a moment to. The refurb Mac with HDD's may be different. It’s a cost-effective fix: Drive prices have dropped recently, so you can get plenty of gigabytes for your bucks. 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). Select your Mac MacBook Pro Upgrades up to 4.0TB MacBook Air Upgrades up to 2.0TB iMac Upgrades up to 4.0TB Mac Pro Upgrades up to 64.0TB Mac mini Upgrades up to 4. 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. Not only can you increase the storage of nearly any Mac, but you will also notice an upgrade in overall performance if your Mac still utilizes a hard drive instead of an SSD.
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