£85 (128GB), £235 (256GB) Manufacturer Tardisk, tardisk.com
3 This SD card-sized solution for doubling a MacBook’s internal storage capacity is ingenious. The aluminium disk slides into the MacBook‘s SDXC card slot to sit flush with the unibody enclosure. It then mounts as a secondary drive in Finder, enabling you to drag over files or set it up as an on-board Time Machine drive. It’s when you spend an extra £13 on the ‘Pear’ variant that it gets really interesting. That fuses with your existing SSD to create a single logical volume in the Finder for a capacity boost without you having to think about which drive you stored files on. Tim Hardwick An almost-perfect solution to the perennial MacBook problem of non-upgradeable internal storage.