Recovery mode includes four basic tools, and gives you access to much more in Terminal’s command shell.
Disk Utility
With only one bug definitely fixed in 10.11.6, out of those recorded for 10.11.5, this update looks rushed. But the jury’s still out regarding freezing.
Your disk’s journal aims to prevent disk errors which can occur after a crash. Here’s how to use it to protect your Mac’s data.
Late last year, the utility for repairing keychains quietly vanished from macOS 10.11.2. No one seems to know where its functionality went.
10.11.5 removes a bug in Disk Utility by disabling the feature to resize some partitions. That’s really helpful, isn’t it.
The list is a little shorter than for 10.11.3, but some old favourites are still there.
How much is the data stored on your Mac’s drives worth? DriveDx is a utility which could save you from that loss.
The list has grown since 10.11.2, with none of the previous bugs being fixed in 10.11.3.
Disk Utility has a bug which can waste a lot of time trying to re-partition drives, and HFS+ creaks horribly.
Being a hybrid, naming disks and volumes can get complex in OS X. This article demystifies them.
The Eclectic Light Company 