Disk Image

It's a good idea to keep sensitive data inside an encrypted disk image -- especially if you are a notebook user. With OS X, standard read/write disk images take up all of the disk space you allocate to them initially during creation, but with a sparse disk image, you can create an encrypted disk image that will only grow in size when you add files to them.

Let's get to it:

1. Open 'Disk Utility'.

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