I have a new iMac running El Capitan. Bought a SanDisk flash drive for backup. I created an encrypted disk image on the flash drive.
Here's the problem: copying 10GB to the unencrypted part of the flash drive takes about 5-6 minutes. Copying the same 10GB to the encrypted disk image is estimated to take 2 hours.
Why the huge difference in copy times? Is there any way to speed up file copying to an encrypted disk image?