I have a 128gb sandisk USB for my macbook pro 2015 13' (the storage capacity for the laptop is 128gb). Can I make the USB like my SSD for my mac (on laptop) so combined it will be 256gb total?


You could try making a DIY fusion drive, but I would expect bad results due to the slowness of the USB drive.

Worse - if you ever unplugged your USB drive or jolted it - the OS would likely crash. It would probably be better to just save less used files on the drive and mount it when needed.

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