Does Disk Utility repair work best in Safe Mode?

[komatsu]

Is Disk Utility most effective when the OS is in Safe Mode?

 

[KALLT]

No, once booted, there is no difference for Disk Utility. Safe mode does perform a disk repair while booting, but it does not use Disk Utility for this, strictly speaking.

Why are you asking?

 

[hobowankenobi]

Disk Utility is most effective when used on a disk you are not booted to. If you need run it on your boot drive, and don't have a secondary boot drive, booting to Recovery Mode and running DU will get the job done.

 

[komatsu]

Some writer in Mac Life recommended Disk Utility be run in Safe Mode.

But obviously, as Hobo has recommended, running it from a secondary boot drive is optimal.

BTW, does the secondary boot drive have to have the exact same OS as the target OS?