Extend your Mac’s storage with Dropbox and USB Disk

Screen Shot 2017-12-02 at 14.19.42

One day I realized that there is no difference between my MacBook Pro and iPhone 7 in terms of storage size. My Mac only has 128 GB capacity and recently runs out storage. So let’s have a look how to extend Mac’s storage with an external disk safely.



1-1. Why Dropbox + USB Disk?

USB Disk is less reliable than Apple SSD. But no worries! We don’t have to worry about data loss if there’s a cloud backup. Dropbox is the most major cloud storage service to upload local files.

SDCZ43 connected to Mac


1-2. Prereq Device

Get a USB Disk. High data transferring speed is a must.

SanDisk Ultra Fit USB 3.0 Flash Drive (SDCZ43)

1-3. Disk Utility

In Dec 2017, it is unavailable to choose external disk formatted with Mac OS Extended as Dropbox folder location due to “unexpected errors occurred”. I’ve verified that it’s able to set only if the disk is formatted by:

  • Format: exFAT
  • Scheme: Master Boot Record

Screen Shot 2017-12-02 at 14.17.42

Unfortunately, exFAT is much much slower than Mac OS Extended. But we don’t have a choice.




1-4. Dropbox

Change the Dropbox Folder location.

Screenshot 2017-12-02 14.22.22(2)

Make sure to change your application settings (Alfred, Dash, etc) to refer new PATH.


1-5. Verified Versions

  • macOS Sierra 10.12.6 (16G1036)
  • Dropbox v39.4.49




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